On a slightly related topic, I've spotted a bike on gumtree which has raised my suspicions - it's the same type as mine so I know about the spec etc, I bought mine for about £500 brand new in 2013, this person was asking for £850! I was actually interested (at a reasonable price) so I dropped them a line to see what's what, pointing out the RRP was £500 so they seemed to be asking a lot - they got back claiming that they'd paid £1000 for it new, and had put suspension forks on it, but I know that model comes with suspension forks and all the pictures show the original suspension forks still on it, all of which makes me suspicious. In the last hour since I've contacted them they've dropped their asking price to £600. Are they just chancers do you think, or something more suspicious?
**EDIT** Okay, ignore this - further email exchange with them would suggest they are genuine, just not very aware of what its actually worth IMHO