When I got VIP access I began to understand what was really going on. Generally the providers will do all the things you like, and they are reflected in the reviews. However, some will charge extra for special requests, like Greek or video. The juicy details are really accurate most of the time.

If it's not, and she asks for more $ for some services, it's called upselling, which is not good.  Tipping is not usually expected, although always appreciated.  AT $5C/hr, I would not expect to give her any more $.  If you have done the research on her, you should already know if she wants more for, let's say, anal, which is a common thing, since it requires extra preparation.

Swim

A legitimate GFE provider will state her rate and that is her rate. $500 should get you good GFE companionship from legitimate providers. A ligitimate provider may charge extra for acts like greek and COF, if they offer those menu items, but their charges are unlikely to be outrageous.

Once you have a vip account, use reviews to avoid having slimeballs in the business rip you off.
There are phonies that will be all too glad to charge you $500 just to show up then ask for $200 to allow you to touch them. Avoid those types, they are a waste of money and time.