In my experience of being at the festival for the last decade is dont bother
The locals shove the prices up and the cough high end escorts try and increase the prices to cover the fact that hotels are charging an arm and leg
I have seen a few WG's from AW at the Festival, the strangest was one who had a owners badge and I saw her arm in arm with a rather famous owner in the horse racing game
It made me smile to think she had rimmed me a month earlier for less than 120 quid yet was on the arm of millionaire