Why even bother with 'cautionary replies', you won't change their mind anyway.
Have you ever turned anyone back?
Actually, I think I have... but there is no way to know for sure. If some roided muscle dude wants to go and trade sexual favors with his body for cash I can't stop him, but based on the "after reports" in PM I receive I think many guys who do this end up being very disappointed. They seem to go into it with romantic notions or assumptions that the John they are going to spend an hour or two with looks like them. Some seem surprised to learn that the John is old, fat, ugly, or has bad hygiene. Here's a tip: for the most part 21 year old gym guys do not hire muscle escorts. It's usually some guy over 50 who does not work out.