It will never happen (as far as I see) that an escort is happy to discuss their pricing structure with us.
Escorting Hub (which replaced UK escorting) became the site where essentially punters and providers can interact but it's almost taboo to discuss there. "These are my rates, others pay them, don't argue"... I have also noticed that pretty much every London-based escort on there charges around £250 an hour and I won't pay that - why should I, I can get a very good service for a lot less - they'd have to convince me they are better than some of the best escorts who charge £160 for an hour.
This site is of course for punters and SAAFE for escorts but punters can read the posts as you don't need to sign up to join. Escorts there generally are not using their professional names so you don't know who they are.
Yes, there are probably a lot of "timewasters". Enquiring and then not booking in my opinion though is not timewasting.