There's been a noticeable change in prices too.
Two years ago you had the likes of Lizzy (British, slim, all services mind blowing provider) for around the £150 and hour mark. She's sadly gone, but trying to find someone similar (in services, not necessarily British) you have to look at £200 and up per hour. And in looks and attitude they don't come close. I'm not spending that kind of money on a mediocre time.
There's a limited pool of good providers. One good review on these boards and we all dash to see them because we're so starved of talent, and they become fully booked.
I've tried RB's too, and it's just as bad, you just get girls bidding randomly, they don't bother to check your listing to make sure they provide what you're looking for so you send an email to check and they say no, don't do that. Well what the fuck did you bid for then!?
If anyone finds a new Lizzy, you have found nirvana.