You have to be very picky, very astute, very lucky or all three to get yes answers to all those questions. Many prossies utilise the vagaries of the industry to treat customers however they want. Customers mostly don't complain - imagine contacting your local MP about the poor poor service you received from "HotFuckSlut" on AW. If customers don't come back, there are more where they came from. Most customers are too embarrassed or fluffyized to even think it could be the prossie at fault. Some of the older and more intelligent ones do try to offer a good level of service. It is rarer on the younger and prettier ones but not unheard of. And there is no standardised feedback scenario. If UKP was like Trip Adviser . . .
Mostly they don't care if you have 'feedback' any more than God does.
Imagine your local church asking you for feedback:
Did God answer your prayers last night?
Were your prayers answered politely and respectfully?
Did you get any thanks when you handed over your money to the receptionista?
Would you say he has acted as befitting his position (preventing wars, general misery, or ensuring my last blowjob was up to standard)?
No. He offers a pretty shitty service by most accounts. And prossies think they are g_d.