Depends on many variables. His openness, his desire for money what you need, what he's willing to do, etc.
I used to see a very straight, handsome personal trainer regularly for "massages" at just $100 a pop, and they were sexual sessions with him froting me pretty impressively, lots of body contact, totally fun sessions for me. He never failed to make me feel fantastic and I always ejaculated with him.
He had his limitations but I don't seek penetration so I was mostly fine with that. Super discreet. Best guy I ever hired.
He could have asked me for more and I would have paid. I think I benefitted from him really not knowing what he was worth.