Well right after I said I dont prejudge people, i'll break my rule and give you a short (semi-serious) list of girls that I would avoid quicker than I would avoid a spa girl as a marriage prospect. this is based on my 40 years of adult single life dating girls and trying to assess quickly whether they are worth spending time on. I'd avoid:
1. She has one of those little dogs, and she brings it everywhere with her in a hand bag, including on first dates. You're always going to be in second place.
2. she lives alone, and has more than 2 cats. enough said.
3. Divorce lawyers. they absolutely cant tell the truth.
4. lots of makeup, very long nails, and that nail art stuff. she'll never use her hands for anything, whether its cleaning the house, or providing you with a PM.
5. she's posting photos of your first date dinner on instagram during dinner. you cant eat your meal before she photos it. Her life is virtual, she'll never deal in reality.
So yes, I'd take my chances on a spa girl, before many of the girls i've met outside the spa. And I agree with the comment that the spa girls are just as damaged, as the customers that see them.
But I also have never seen this as such a bad thing that everyone in this business is eternally dammed. There's much worse crimes than providing a little pleasure and entertainment.