Well, couldn't you use that same argument in the instant model?
a) Yes, the priceline model assigns you to a room of a quality, and guys may not want that in a hooker,
b) There aren't that many guys who show the kind of prefence you state, and if they do, they just don't use priceline.
c) I wouldn't use an exact priceline model in this case, just like I wouldn't use an eBay model. I think, though, that one closer to priceline would have a better chance of success than one closer to eBay, for a plethora of reasons.