I like your rules! Thanks for sharing your ideology.
My (unasked for) point of view:
Everyone has different boundaries, yes. I think you can find providers who are emotionally intelligent at every price point. It just may take a little trial and error.
It is really just like any other service (finding the right therapist, masseuse, etc): some people you click with, and some you don't. To expect relations outside of a paid time frame crosses boundaries. But to maximize intimacy potential in the session? Why, that is what we are here for!
Personally, the emotional intimacy and therapeutic aspect of my job is what I love the most.
If you are unsure about what is/isn't okay, ask! Some of us are kissing experts, but not big into cuddling. Others of us will rock your world, but can't keep a straight face during dirty talk. When in doubt, follow our lead.
Keep in mind that emotional boundaries (info about our private lives) are just as real as physical ones. Some of us will listen to you talk about your home life, but are tight-lipped about our own.
Just like in dating, building a comfortable rapport takes time. Just like in dating, sometimes two people just don't have chemistry. They may fumble, knock heads, or endure the dreaded awkward silence.
Any professional I know does not take this to heart. In fact, I have been known to play 'matchmaker' with my clients and my colleagues, and recommend a friend.
I think you are coming into this asking the right questions, and showing the desire to be sensitive to our comfort levels. With this mentality, you shouldn't have a problem finding a lovely creature to vibe with.
Best of Luck,
Eliza :*