Years ago, I spent 250 quid for an hour with a well-known (at that time) porn star, since retired. It was OK, and all as advertised, but pretty unremarkable. Didn't do that again.
And around that time, I also saw an agency girl a few times (also since retired) who was stunningly beautiful, at least in my eyes, and who provided an exemplary service. She was 200 quid ph. Lot of money, yes, and not something I'd do again in a hurry, but each event was faultless and she's someone I've not forgotten, nor am ever likely to.
These days, 120 ph is about it, or 150 ph for someone exceptional.