I would imagine these guys on SA know the marketplace. If they are in it for NSA or fun, i presume they will have a dollar figure in mind. Most would probably be similar to escorts in the local area or higher (i would expect). If you look at the local rentmen ads, what are the guys charging there?
For the guys in option 2, what happened? Did they take up your offer? I’m not sure i would offer anything for someone that had “nothing special”...