The ladies set the price, we decide what we're willing to pay......take it from there.
$300 is generally my limit.

This depends on where you are.  In the Boston area $300 an hour is the going rate more or less.  Based on what I see guys posting it seems like it may be higher in LA, Vegas and a few other parts of the country.

You will get a better idea of this by checking the local reviews in your area to see what the ladies are getting.

Remember, her price is her price.  It is not open to negotiation.  If you don't want to pay what a lady is asking it's best to move on.

In my area, 200 is the least I expect to pay for FS/GFE hour.  Some are more...  apparently they can get it.  A low rate...  sometmes advertized...  as a teaser is for less time or less service.  
Higher price does not necessarily mean better service.

Prices vary by city and by lady. The going rate for real deal ladies in my region is about $300/Hr. Beautiful, exclusive ladies charge more.

in the DC area its generally 250-300 on average but some go as high as 350-600 but seems to be average everywhere except for NY and vegas normally 400 to 500