A product or service is only as valuable as the price someone else is willing to pay for it. If a girl posts a price under $200, and she attracts customers, she is a successful, professional escort.
It would be nice to be able to link quality of service to a price, but in the escort industry that's just not possible. You don't always get what you pay for, as this site has shown us time and again.
If I were looking for an escort, budget would be a consideration, along with reviews and menu. There are plenty of well-reviewed escorts who charge less than $200/hr, and I have purchased some quality items at clearance sales. The only difference is that I can compare specs objectively with appliances and furniture...escorts are often ymmv and subjectively reviewed.
Offer me a satisfaction guarantee or warranty and you might be able to defend high price=quality in this industry.
(forgot to add that human trafficking is a completely separate issue from this...not cool to sell people for sex or anything else)