I’ve never lived this lifestyle and don’t agree with it but here’s an AMA from a guy who claims to regularly get high end escorts. Supposedly the cost is anywhere from 250-1000 and that might be Australian dollars?
https://old.reddit.com/r/AMA/comments/1cfpcfl/ive_slept_with...
I knew a guy that was a driver for escorts back in college. In the late 90s it was over $1,000/night on average iirc. That included more than just sex though that was also attending a gala or sports game or other social events with you.
You can just browse the backpage for a bigger city to get an idea of prices. Apparently basic sex pays below $200h/h in Seattle (chosen at random), so those higher prices would likely be for a night/event/high class.
That sounds like per hour. If you're curious about how the whole thing works parts of it are fairly above ground - community support subreddits and advertising websites with rates for example.