I also think that the stated rules should be good enough. Its just that those rules need to be a bit more obvious. Old-timers all know the basic rules to the For Sale section. What about the newcomers? If the rules are not visible, then are the newcomers just to assume what they are?
Judging by the postings that have been going up, a lot of newbies are taken in by the camaraderie and given a false sense of safety. This just drops their guard and they assume that everyone is a "good guy" and they throw common sense to the winds . . .
I am not saying rules should be put into place (they are already there). They just need to have a higher profile. Maybe some kind of nag that tells them they need to be cautious, that they assume their own responsibility for their conduct, and perhaps a statement that absolves this web site from any liability for the transactions that take place there (aka, you are on your own!). Like the rules in the old forum, and in the older forum/BBS board.