While i agree with your basic premise, i beg to differ on the point that exploitation of OB girls is anywhere near as that of those in service bars or those in prostituition dens like Kamathipura. The degree of exploitation, the existence of free will and alternatives makes a big difference. There is reverse exploitation in some cases, where OB girls bleed the patron dry. A friend of mine, who had visited this village in Andhra, told me about the situation there. This was ten years ago. May be things have changed but I frankly doubt it.
My conscience gets pricked if I feel that I am exploiting someone. I never want to do that. I have paid many girls without taking their service, when I felt that the girl is not willing. Many mongers have done that. The reason, I monger is to have a good time. I can't imagine having a good time by exploiting another person.
Bro, this is my opinion and every person can have a different take on this. If a OB girl gets flat gifted in Navi Mumbai and an imported car, I do not feel that she is getting exploited.