Dave, sorry to jump in on this message but I really think your over thinking this all, there's aren't conspiracies out there. I don't sell gold proofs or these graded £5 as I simply can't afford them, like most collectors, however abroad there has been for years high demand for this type of coin and they've driven the market place for them. If they are willing to pay the prices mentioned it doesn't mean people are pushing an agenda of greed. Im sure you've sold coins at a profit in the past, and if a dealer does there's no harm.