What you on about. They just charge the most they can depending on how busy they are.
If they get a no show then it's up to them to take an extra booking later that day, or do without.
Doesn't need a formula.
The whole charging structure is a complicated business.
Some might charge £130 all in - no extras.
Some start off at £100, then it`s £10 for this, £20 for that etc.
Some WG`s have profiles whereby it takes longer to read it than to fuck her.
At the end of the day, I know what I want and know how much I can get it for, and if anyone is over that amount, they get binned.
Some blokes are happy to have an all nighter £1000+ and what do you get for that, a fuck, a meal for two that you have to pay for, paying her to be asleep most of the night, then another fuck in the morning.
Sheridans - I fucked 4 birds in 1 hour £130 all in - that`s what you call a meal deal.