From my perspective I certainly need to be attracted to the provider but they don't have to have top model looks but they do need top provider skills and excellent customer service.
I would rather pay $300 for someone with average looks and body that will cater to my needs on a personal basis than $100 for a young hotty that is mechanical.
That said, $200 is my comfort point where I can see the same provider once a week that already knows what I need and fulfills me completely.