You shouldn't be cruising for that kind of thing on Craigslist. And, think about it, anyone who looks that good doesn't need to go on CL for a hookup, anyway. This girl is a "pro" - looking for $$. Good luck!
I'd agree that CL became overrun with prosties years ago, and "easy" girls coming from nowhere have a criminal agenda and may not be female. But you've no evidence that Zach was using that venue.