Any ideas?
Or why they do it?
What's their gain?

The fake ads and stolen photos are scammers usually from places like Malaysia. These bastards have sophisticated systems to lure horny lonely men into thier trap. I fell for it up until the hot woman that I thought was ready to play began asking me to send her money.....thats when I called her bluff and demanded she verify that she was genuine. I got pissed and said "Alright DUDE why are you trying to rip me off".....then we got into an online shouting match where the prick started insulting me for almost believing that he was a woman. Play very safe. Those ads with super hot babes are all FAKE ADS. Reality is.....most women....probably more than 99 percent do not ever post personal ads looking to get laid. Thats why we must pay escorts to "service" us. They are the only real women that us porn minded horndogs will give us the action that we cant stop craving. I am learning and realizing that we must totally respect these special ladies that put their asses on the line to try and earn a living.They really do deserve every penny they earn....so treat them with respect and pay them well.

I can't help but wonder what would have happened had I agreed to meet up with a "provider" that I had found on eros-la who was posting stolen photos of a super model! Was it LE? Maybe a setup to be robbed on an outcall? Was it legit but how would she have explained the stolen photos that weren't really of her?? Needless to say when I emailed her and confronted her about it I never heard from her again

people with no profession, talent, skill, ability that lie, cheat, rob, steal, etc.  They will do anything, ANYTHING for money.  Just as an addict must get a fix, those who worship the golden calf become crazed without.  What is interesting is that man and woman for thousands of years got along just fine without money.  So the people behind the fakes and stolen are those who would starve to death without money.  It is just as true today as it was 2000 years ago.

In my experience, the women I saw were simply trying to protect their identity--they were in the business for just a short time and wanted to make a few bucks. They weren't looking for repeat business. Having said that, I usually avoid providers with fake photos. Women who provide real ones, even with the face hidden, are usually more professional; while those with fakes are more likely to be ROBs.