There's a very simple reason why some WG's have prices of £600 or even more: it's because enough punters pay these prices to make it worthwhile to advertise at these levels. Now, it's not my business to tell anyone not to pay as it's their money, but I have to say that paying excessive amounts only serves to raise the ceiling at these levels which I do not believe to be for the good of many punters. The best scenario would be for virtually all punters to refuse to pay and market forces will cause prices to drop to more reasonable levels.