I just spent the last 20 minutes combing over this thread and opening quotes I wanted to reply to, but the gist is pretty much the same:
We are all people. We meet other people we relate to in the strangest of circumstances. Yes, they can work out. They can also not work out. Yes, escorts fall for clients and yes, clients fall for escorts. It takes a cruel person (not escort, person) to take advantage of that very human flaw. It's true across every profession, and isn't industry-related.
(I posted that it was impossible a few years ago, and I was wrong. It's just really unlikely.)
That having been said... I think everyone does best by bringing their most open-minded, most open-hearted self to the table. Long-term escort-client relationships are real, and very, very rewarding. I've met people about whom I care what their life is like, outside of me. I care about their wives, their children, their personal successes, and how they deal with their failures. It's unlikely (not impossible) that it'll expand to more, but there's so much to explore between two people that to not be your most vulnerable is to do the two of you a disservice. (Double negative, sorry.)
I consider some of my "clients" my close friends. When you spend enough time together it's inevitable; "clicks" happen everywhere.
This openness makes the connection (and sex!) real.