No idea really. What about the % who would be willing to do it to make good money, but are afraid of the consequences? Is that even a thing? I'm betting it is, but I have no personal experience with prostitution.
My GF used to be in the ahem, Canadian ballet, back when it was just peep shows. She could see where it was going in the late 90's and decided to leave the show. Seems a lot of women will do whatever, if there is enough money involved.
Maybe in the off season...