What a WC is for
Whoever pays a prossie up front must need his head testing.
Only real exception is if it`s an outcall, out of her normal rate area, the guy is a newbie with little/no feedbacks - she`s got either tons of good feedback on AW and or well reviewed on here, and just wants a token amount, like £10-£20
Plenty put that in their advert and can`t really moan, they have lost out to timewasters so just covering their arses for the petrol money.
No way is she going to risk the reputational damage and massive drop in bookings for such a tiny amount.
I`ve been asked by newbie girls and told them to piss off, i`ll book someone else, when you`ve feedback well into three figures, you can call the shots.