You can get bitten at any price not sure why its any worse at £600? I absolutely believe that some escorts are worth this price (obviously depends on your wealth etc) but increasingly few these days are of sufficient quality to warrant the price.
Quite right. However, if we apply the theory in economics known as the law of diminishing returns.
Basically put, when investment in a particular commodity increases, it gradually reaches a point when output/profit returns rate will be less... and from that point the more you invest, the less output be yielded.
From experience, I found this theory to suit punting in the same way.
The more higher than average prices (the max average) that punter pays, yields less satisfaction in return (very much inclined by a decline in the service offered).
Average could be £120 to £300. Maybe even £350.
Girls charging more than that aren't necessarily more attractive and those rates could be said to reflect a level of greed.
In most cases greed is a negative force so diminishing returns theory applies.