Petruchio, good on you for doing your research.
While I don't judge the BP advertiser or those that use it to procure services, I just did the same thing, just testing the consumer experience in the Dallas area. 60 ads and 60 minutes later, only about 12 of those ladies posted their own pics. Honestly, I can see how a gent can give up before he finds a decent provider.
I think some ladies use fake pics to hide from relatives, or to keep those that may use the information to hurt them. From my understanding they're not all trolls. And a lot of these ladies are young, and are pretty much fly-by-night, and using fake pics offers a bit of flexibility in reputation management. Get a bad review? New pics, new number, voila. New provider.
What I have learned recently is that very few gents actually know how to screen providers, and rely on just reviews to vet ladies. The others love the thrill of TOFTT, and use BP for the instant gratification, and are most likely on their phones, or their window of opportunity is too small to do proper research.
If you have the opportunity, it would be nice of you to share your secrets with other gents, just to give them something to think about.