When a girl is starting out in this business, and it is/should be a BUSINESS if they are serious. And they need to market themselves - as in any product or other offering. For London, I think £150 is the going rate for a good looking girl but that SHOULD include OWO, CIM etc. Fine, anal can be extra, but I think OWO and CIM are pretty basic services these days. And there are some excellent HOD girls in London who do all that for £130.
And girls I know say the key is build up a REGULAR clientele. One way to do that, if you do not want to cut your price, is to offer an extra, say, 15 minutes, for the standard price. Maybe as an introductory offer. And to not clock watch. If a guys gets an extra 15 minutes, it starts to look like "value" to them.
Girls have this view that their time is "super valuable". But is only valuable if you have a string of customers queuing up. But most girls do not and have time between bookings. So letting a guy stay an extra few minutes costs the girl nothing and builds real goodwill.
And the goal should be, I have been told, to get to 50 - 60% regulars, a good percentage of those who see the girl regularly - weekly or every other week.
If you are good looking, friendly and provide a good and consistent service, with no dramas, and have good comms, then it seems to me a girl can make real money.
Anyway, the above is based on many years punting and getting to know quite a few excellent service providers