There seems to be a lot of complicated issues here. Yet, it's amazing how basic economic principles apply, and the bottom line is simple economics.
Give me enough information to make an informed decision, which will involve some communication before the decision is made. If I can get most of that from the ad, great. I need to feel secure about where I'm going. I need to know that I'm going to get what I'm looking for and that it's a wise use of my money. I need to know that my discretion is absolutely protected. That takes asking a couple of questions. And if the answer tells me that this might not be the best choice, that should be OK. I'll be up front and tell you "I can't afford that," or "that's not what I'm looking to do, sorry." If I get the impression that my questions are irritating, or putting someone off, or a bother, I'll just move on.