At Gtm hr massage is $60 I have always tip $40 as the girls ask for. Other place charge $70/hr and tip is $30. Usually total cost is $100
I usually don't negotiate that $10 just to get a better service from them.
Once at gtm2 I tip $50 as she did an awesome job. Next visit she expected $50 again. after that never saw her again.
Who did you see?