@mapman : I can assure you the vast majority of those people have zero intentions to buy or sell anything here. the "potential" part is close to zero. They are here for the mayhem in the forums only.
I am sure that happens, but I don’t think that alone violates any site rules. An audiogon user gets access to forums and ability to transact. So I would assert that is just par for the course. Also if one gets caught up in the forums actually discussing hifi and music, there is perhaps a greater chance they will buy or sell something. I think that is why the forum exists.....to help plant the seeds per se.