Another side to this is guys are only going to be 'available' once. Once they see one provider who agrees to his 'fee', he's done.
What if 2 or 3 ladies see his ad and decide that they can work with his limit? He bites on the first one, and 10 min later here comes another.
Before any of you say, "Well, if he has the stamina he can see both." Maybe so, but now he's a liar. He just told Provider A that he has only 'X' amount in available funds. What if he sees two (or more) ladies on the same day and later on they all find out about it? The hobbyist becomes a lying conman.
I don't think that would sit well with the girls.
Sit on a few bucks and pay her normal damn rate, or pay for someone's rate that's more your speed.
It's not that hard.