there are a lot of guys like you that are mongers, who separate escorts and spa girls, from "regular girls", and treat them quite differently.
I for one have never seen it as a sharp line between good girls and bad girls, more like a blur of morality. I probably couldnt fall in love with a streetwalker, or a drug addict, but I also probably couldnt fall in love with a puritan, who believes sex is only for getting children. In between is a range of sexual morality. There's plenty of "normal" women who sold themselves to guys, because they were rich, bought them good things, etc. could be many of the wives of the guys here.
There's plenty of girls in spas that i've found had a heart of gold and are infinitely more moral than a conniving gold-digger. I wouldnt sit in judgement on anyone, and just say that because circumstances put her in a situation where she has to do this for money, she isnt a quality person worth dating/marrying. But I also dont sit in judgement of you or your attitude. I just approach it different. every girl I meet is an opportunity to make another friend, and i try to treat all of them as equally as I can, at the start.