While I am completely uninterested in all the trolling and drama that this thread has devolved into, I am going to pipe up with some information because a newbie has asked.
What is termed a "tip" is actually the MPA's whole entire pay. The "house fee" goes to the business - for rent, supplies, hydro, etc etc etc. If a girl sees no clients in a day, then she is paid zero for being there for 10 hours or whatever.
Another misconception is that this is "tax free" money. We are in the same tax situation as freelancers / independent contractors, so we have to figure out our CRA contribution every year, it's not taken off of payroll as if we are employees. We also don't have any benefits, so we have to pay for dental, prescriptions, vacation, etc etc etc out of pocket.
So please, don't haggle or beg for services that aren't offered. Remember that she is a person, and it is her body, and what you are giving her for the time is her pay and her livelihood.