Will just echo what others have said. I am not big on forums (fora?) and out of all my interests (others being a distant second behind cricket ofcourse!) the only forum I visit regularly is about cricket and this one in particular. Generally speaking there's good advice to be had and good banter within bounds. Even some good heated arguments from time to time which are mostly constructive. Buying/selling is the tricky bit in any community so some tensions are bound to arise but as long as there is a good presence of trustworthy retailers, then on the whole it is beneficial (as PM7 said above)
Hopefully FC's shout will reign in deviant behaviour before this goes downhill.