You might get criticism for the fee you paid. I've "overpaid" for a session, but have no regrets because I was really happy with the service. I guess I'm a nice guy too. Maybe it's my respect for these women that work hard to make us feel good. If the service is bad, rushed, the provider is bored or disinterested, they deserve a minimum tip. If I walk out the door smiling and feeling good all over, that's worth it for me.