Bloody hell that left me reeling!
I am going to try to offer a wee bit of perspective from my side of things. I have done the low-end(window work in Amsterdam)-Mid range, and I have done the Belle de Jour route, and the only difference I find is the expectations of the client, and how you are allowed to manage them. At the end of the day it is about customer service, and managing expectations. The gentlemen who comes to the window have the same needs as the one sitting in the presidential suite at the Amstel Hotel. But the difference I find is your control of the situation shifts. When a guy is paying 50 buck for a quick screw, I can after an allotted time tell him "Time is up, pay more or piss off!" But when your Arab prince has paid you several thousands of euros for the pleasure of your company, and is fat, balding and smelling of garlic, with armed body guards, and Dutch secret service at the door, do you really think I can tell him, I don't kiss! I find something I like about him-fast, and keep that in the forefront of my mind to get me through.
J, if you are playing in the high end of the pond, then your clients will have high end expectations! They are bloody high strung prima donnas, who have every whim catered to and for. When a man is paying 400 pounds for the pleasure of your company for an hour, he doesn't expect to be told no to lots of things. Also, this is why when they are in the bathroom, I gently point out the disposable tooth brushes and mouthwash!
Even if you aren't logged in there is still loads to learn here, so hopefully you will lurk in the back ground and benefit for the good advice here.