You're sounding like a Saafe girl!
Why? Because I think that a WG has the right to charge whatever she wants, and is allowed to be happy with the amount of customers she has?
Look, if she was complaining that she wasn't getting enough work then yes, I would be suggesting she tried lowering her prices. But she's not complaining, she's obviously getting the work/clients she wants, so why SHOULD she lower her prices?
Personally I used to charge £120 (for the first hour), which I had to increase because I couldn't handle the amount of booking requests I was getting (due to having fulltime/erratic hours civvy work), and I'm now at £180 (for the first hour), which means overall I get less requests, so the amount of clients I can see is much more manageable. UKP might tell me to reduce my prices, but by doing this it would mean I wouldn't be able to do my other job. And as I'm one of those "fat old prozzies", I'm sure UKP would like to see me charging £60 an hour, but this ain't gonna happen!