I realize this poll is one sided, from our side. If immediate satifaction is needed then maybe Rosie Palm might be better, right in the comfort of your own home!
The other side is to make sure the SPs are making sufficient income to continue in their chosen career field. If they only receive $20 to $40 a shot and with the aggrevation of making the appointments, etc. (no shows, multiple telephone calls) they may end up wotking in McDonalds making more money. The counter to this is that we would visit them more often, well, being older, I can only perform so many times a week. No complaints as my style and quality of service has improved with age.
Maybe here's the solution, you find a regular SP and arrange to have multiple visits per an agreeable schedule and you pay weekly in advance. If you don't show, she still earns the money.
I personally prefer a much longer time together ... overnight is terrific!