I think that one of the factors might be the increasing presence and impact of camgirls. They often advertise as escorts, but will only (if ever) do so for a high fee. Therefore, we get loads of profiles on AW wanting £200+/hr, with zero AW feedback, let alone any UKP feedback. The escorts who provide a good reliable service see these and think "If that's the going rate for 0FB, then I must be worth £XXX/hr with my good feedback and experience". Who can really blame them, and so we go on...