Who's to blame? The seller who wants to maximise his money or the vultures on here who dive over everything thats for sale, PM'ing better offers in order to gazump the initital buyer? When a Mountain Goat is sold in 120 seconds, is it any wonder people are behaving like this? Its all got a bit silly.
If you really wanted to be fair you could have listed it on Ebay with a BIN of 350 quid.
Reckon most people now think you want to make a few extra quid once you realised people would pay more than your asking price.