Avoid Peter gratwick like the plauge. Never got my ck headset and after 3 months of chasing and then finally posting on his Facebook wall to him I got a cheque.
See, there's always two sides to every story. I've had no issues with Pete, pleasant to deal with, I got what I wanted / asked for / was agreed and at a price I was more than happy with. Personally, I'm not bothered if he's a serial bike buyer / splitter. I accept that might be a (small) issue for STW but it's shades of grey IMO. I doubt his "business empire" challenges Leisure Lakes or the like 
Then again I've never subscribed to the "favours" sort of feeling some people seem to think disposing of stuff thru' the Classifieds on here is. Incidentally, nor do I subscribe to slipping STW anything for using the Classifieds.
As the Duckman / Andy exchange, above, indicates - two sides. The only (sort of) clear cut cases are the ones where someone has royally fleeced umpteen people - I can't remember the names but there's been a couple of well (forum) publicised situations over the years. But they're the exception, IMO.
I don't blame STW for not wanting to get into management and regulation of the classifieds, what a PITA. Personally I doubt there's that much rip-off going on, certainly given the likely number of sales. Still, folks make more fuss over the limited negative experiences as it's human nature.
