It's traditional for genuine dommes to not have sex with their clients. Never really understood that myself. I'd pay good money to be tied up and given a good seeing-to by a hot young domme if I could swap places with her at the end and give her a shag.
And it's odd that while there are women who will engage in casual sex for free - nowhere near enough, but at least they exist - there don't seem to be any dommes who do it for free. I'd have thought there would be a few women out there who genuinely get off on having total power over a man. It seems that this has to include power over his wallet, or they're just not sufficiently interested.