This is dead on, and I'm not sure how it even came about.
I think at some point, men would go there with that expectation in their heads that nothing was going to happen, would get drunk, would see how much money it would take to get them to do it anyway, and finally found their real price. Then word got out amongst the girls that you could make x amount in one night to bag a guy you'd probably bang anyway (or the man-hating fantasy about being really bad at sex but still taking a lot of his money away), and here we are.
I think at some point, men would go there with that expectation in their heads that nothing was going to happen, would get drunk, would see how much money it would take to get them to do it anyway, and finally found their real price. Then word got out amongst the girls that you could make x amount in one night to bag a guy you'd probably bang anyway (or the man-hating fantasy about being really bad at sex but still taking a lot of his money away), and here we are.