I started seeing SWs seven years ago but not that much until three years ago. I just wanted to get an idea of where you are coming from. If you are actually in the game after a while you will see for yourself that the vast majority of SWs are not pimped out mentally ill drug addicts. For those that are your question about tipping is weird - just stay away from them rather than participate in their exploitation.
Clearly you have never been to Seduction much, the intel here is that most of them are drug addicts with their black pimp's name tattooed on their bodies, they have black pimps that hang out in the parking lots keeping watch on them, and the SPs do drugs in their cars during their breaks.