Actually, it's not easy to sort out at all. Ever tried being 'slightly involved' with a police investigation? Take a look at the length of eBay's disclaimer and imagine that their legal team is probably bigger than this site's membership.
http://pages.ebay.co.uk/help/policies/u ... ement.html
However, this site is run on a not-for-profit basis so we simply can't afford a legal team on retainer to mount a defence because somebody isn't happy with a deal and decides to sue everyone they can. We simply cannot afford to be even taken to court, much less lose.
Ass that it undoubtedly is, the law does not allow us to simply post a total disclaimer which would keep us clear of the courts if the worst came to the worst. (Which, BTW, in the fullness of time, would surely happen).
We are looking into ways to do this if possible, and all suggestions welcome.
A lot of people would like to see some sort of buy and sell thing, and the mods/admins are aware of it - I suspect we'd all like to see it happen as well. No promises, but it is being looked at seriously.