Occasional

Makes perfect sense to me, both the offer and the acceptance.  Really, the 300 first hour/ 500 two hours structure is 100 'setup fee' for freshening up and preparing generally on the provider's own time, then 200 for each hour of the client's actual presence.
Sometimes, with a new provider where I've booked an hour, I've asked around the halfway mark whether we can go over the hour on the basis of (in the above example) any excess being paid proportionately to 200/hour, so we can relax into the session without clock-watching, just letting it take its course.  Generally, there's been agreement,, and I always then settle immediately before leaving and I round up in the provider's favour - rather than pulling out a calculator;-) - as a thank-you for the flexibility (tipping isn't a thing in London). 
 

If I am looking for right now, you only get 15 minutes from me if you have the "Available Now." Then I text someone else. Whoever answers first gets my money.
This is the service industry, boys. I'm paying for service, not sex.

Agree. It’s a bait and switch. You’ll get drawn in, probably pay a deposit and then your chosen masseur ‘Oliver’ or ‘Lucas’ won’t be available and you’ll get someone else who won’t look like Oliver or Lucas, if you get anything atall.
Book me instead. I don’t look like those boys…but in a moodily lit room, with good ambiance and of course stimulated by my expert hands you can imagine I’m Oliver 😉. (And my 🍆is undoubtedly bigger than his too). Plus I’m real, less expensive and give a fabulous massage. 

... especially if, as part of the repeatedly-suggested advance communication with the escort, you make it clear that his gym time is to be spent flaunting himself dressed in short lycra tights with no more than a four-inch inseam, skin-tight crop top and knee-length white socks, so you can discreetly work up a lust for him stretching and bending as he lifts weights

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

As a fellow Brit, I would opine that Mike Carey's words were in fact not rude within British culture.  Not when written, nor indeed when spoken - unless accompanied by a slight hint of undue emphasis, or other subtle innuendo of facial expression.
Now, if he'd said "How very interesting!", it would be a different matter altogether ... 😉 

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

As a fellow Brit, I would opine that Mike Carey's words were in fact not rude within British culture.  Not when written, nor indeed when spoken - unless accompanied by a slight hint of undue emphasis, or other subtle innuendo of facial expression.
Now, if he'd said "How very interesting!", it would be a different matter altogether ... 😉 

As a fellow Brit, I would opine that Mike Carey's words were in fact not rude within British culture.  Not when written, nor indeed when spoken - unless accompanied by a slight hint of undue emphasis, or other subtle innuendo of facial expression.
Now, if he'd said "How very interesting!", it would be a different matter altogether ... 😉 

As a fellow Brit, I would opine that Mike Carey's words were in fact not rude within British culture.  Not when written, nor indeed when spoken - unless accompanied by a slight hint of undue emphasis, or other subtle innuendo of facial expression.
Now, if he'd said "How very interesting!", it would be a different matter altogether ... 😉 

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

Yes, a couple of times.  My attitude is that they're simply in the wrong line of work. I don't hire them again.
I am of retirement age (a fact I always share before a new hire), but I work out regularly, am well groomed, have a Body Mass Index at the low end of normal and I am courteous. I don't pretend to myself that I'm God's gift to men, but I've no wish to pay for a provider who is simply seeking to monetise their sex life.

Absolutely it’s a choice! Not necessarily easy cash though. Everyone thinks ‘great! $200 an hour…or even more!’.  What they don’t see is the days you get no clients….the hours you spend dealing with flakes, the time spent trying to keep fit, the risk of catching something, the time you can’t work because of being unwell (no sick pay), the being available almost 24/7 often with a couple of hours notice. Yeah, easy cash.
I’m not complaining though, it suits my temperament and lifestyle but it’s not easy money. Honestly I earned more and it was easier when I had a full time corporate job. But that was utterly soul destroying …so I swapped metaphorical ass licking for literal ass licking. 

A price provided.

Yep, men always playing a role that they think they need to play, through having learned it, feeling conditioned by society / religion / family to play it. Hiring can give them an opportunity to be their real selves for a while and maybe start to learn that skill to take outside of the session.
I think of it as ‘You want to be your real self? Whatever that is? Ok let’s take our clothes off because they are masking you. Let’s drop our guards by communicating without words because they are loaded with judgment and meaning. Let’s use a primal human need like sex (and touch, and intimacy) to let go of all the labels and roles and judgments. How does that feel? 
I’d say that’s what’s going on in 75% of my sessions. Clients come first for the massage, and the sex, but they come back for the opportunity to be intimate, vulnerable and to find themselves. Same with me, I started doing the work thinking it was about massage and sex. Now I see it as something else. 

some newbie advice.....
https://www.companyofmen.org/topic/142802-etiquette-for-initial-communication/
https://www.companyofmen.org/topic/130365-caveats-in-hiring-please-contribute/
https://www.companyofmen.org/topic/83821-advice-for-a-newbie-please/
https://www.companyofmen.org/topic/103088-newbie-question/
https://www.companyofmen.org/topic/13389-recommendations-for-newbie/
be to-the-point, brief, professional in communication......no gushy daily texts!......smile, have fun, talk slowly, ask him what he likes, no money talk, look him in the eye, firm handshake....... no deposit!!

Charge your normal rate. Because although he has said now that he doesn’t want any sexual activity that is highly likely to change, either at the first session or subsequent ones. In that situation, if you have discounted, it’s not easy to then charge the normal rate again. His expectations are set and if sexual activity did occur he’d possibly think it was because you were happy to do that outside of any transactional service. That all becomes very difficult. 
If he books you at the normal rate and expects to pay it, and nothing sexual happens then you do have the option of giving him say 20% back after he’s paid you if you want to. Then you’re in control of the rate. 
 

I prefer the provider to respond exactly as he did.  If I say "I'll keep you in mind for another time in the future" (similar to your "Maybe another day", although more clear that I'm not trying to set something up right now), I expect nothing more than "OK" as a reply, if that.  When a provider counters with "What about Tuesday evening or Wednesday morning", I actually find THAT a turn off.  I already said no and will reach out at a future time, so respect that.
This provider did exactly as you asked.  If you wanted him to reply with  times he was available, a more direct "what times do you have available after after 3pm this Wednesday or after 1pm next weekend" would have been the phrase to use, not "Maybe another day".

This is not a correct analogy, because the server is working for someone else who has set the prices (the server did not set the prices). If the owner of the restaurant was also your server, there would be no need to tip him - he's the owner who set his prices and profit margins. 
As a former business owner in a service industry,  I never tip my provider - they are working independently for themselves, and therefore have determined their own pricing / profit margins to make a successful living once they began their business of massage / escort. If they are charging $200 for a one-hour massage, then they have determined that the $200 covers all expenses for the hour, and the rest is profit (that includes hotel expenses if it's a traveling provider). If they want to throw in 'extras' -  to me that's part of what sets them apart from the competition and has me returning to him as a regular client. That's pretty much a standard model for every business surviving these days in the service industry (though they don't usually call them 'extras' - they call them 'rewards program' for their regulars).
Aside from masseurs and escorts, I also don't tip my barber (he owns the business, so he has set his rates in his business plan from the day he opened his shop), my pet groomer (she owns the business), my landscaper (he gave me the price of cutting my lawn each week), or my house-keeper (she gave me the price of what she charges to clean each week.) I do, however, bring each of them (including my regular masseur) an expensive gift at Christmas / New Year's. 
Back in the days of me going to NYC and hiring through the agencies - yes, I did tip the provider because I know the fee I was charged was shared with the agency (so for a $200 appointment, $50 went to the agency for booking the appointment and the guy kept $150 for himself, as it was explained to me once). But that was more than 20 years ago, and today every guy works for themselves and has set his prices. 

As a former small business owner, I will share this...
The 'rule of thumb' (and long-time protocol among many over the years), is this:
An owner sets their prices, and those prices cover all their expenses, their salary each week, and their profits each quarter. If the prices don't, then they're doing something very wrong - and need to recalculate their pricing so it does cover all the above. 
So by tipping the cafe owner, or the hair salon owner, etc. I'm essentially  telling her that I know better than she does, and I've taken it upon myself to determine she needs help financially, because she's not earning enough with the prices she has set for her business. In other words, I'm insulting her as a business owner. I'm essentially telling she's not charging enough to earn a living, so my extra few bucks will supplement her income. That's insulting to any business owner who should be respected by customers, instead.
Of course, servers or stylists who are not 'on staff' are completely different, as they are not owners and have no control over pricing and profits, etc. So yes, they may need help with their personal finances, and tipping supplements their income. 

One of the main reasons I hire is so that I can find a guy who can host in a convenient location at a time that works for me… if that is removed from the equation, it kind of defeats the purpose of hiring (at least for me).