An accomplished provider must have great flexibility of not only body but mind and emotions. Her survival depends on her ability to accomodate the myriad body types, moods and fetishes of the recipient. Not an easy task, especially if she finds an act or person repulsive.
But, as a monger, that is also true to some degree, especially when meeting a gal for the firt time. She is an unknown. She must be assessed very quickly because the clock is ticking. Is she a natural-born lover or is she a supreme actress? The monger must also be able to shift his game plan to adapt to her natural tendencies beause she might not be inclined to his set pattern. She might do everything, because she is paid but it probably will not be ultimately satisfying, because it is clumsy, robotic and forced.
If a guy is stuck to his set pattern in the bedroom, then it is better for such a person to find a high-priced or low-priced or even SO that he clicks with.
The price a girl sets on herself is a function of her self-image. She might be lousy in bed but can look pretty. I play the game on the cheap and remain humble. I go into a session expecting nothing except the opportunity to create something out of nothing. That's why they call it "making love." It is not there until you make it.