As a hobbiest, I consider that behavior as very professional and a mark of respect for the hobbiest. In my book, if the SP is playing a role and is not authentic, it's a real turn off and I feel that I'm considered as nothing.
I do not expect, as a hobbiest, that the SP will be turn on every encounter she will have and get off each time, but, at least have enough consideration for the hobbiest to be honest and respectful not to fake. I prefer have a nice time, even on both sides it's not an orgasmic moment.