A newbie fox might try to charge extra, but the service oriented ladies that have been around for a little while will not likely charge you extra, especially for the 1 hour sessions.
And if a lady is not service oriented, she is not likely to get much business after the initial "let's try the new girl before she quits" effect has worn off and she will almost certainly move on. I believe this is mostly why so few girls stay with CF more than a few weeks. Though I also believe some are trying out the life style for the first time, attracted by the seemly easy money and the professional atmosphere offered by CF. Again, the attraction wears off fast, especially when they start having to spend 8 hours in the den and possibly not even getting a single session, again after the new girl effect has worn off. I have experienced some real sweet hearts with very low miliage who I would have loved to see again, but who quit after a few weeks ;-(
JD