That gives one hope. Have the mods discussed possible ways to deter scam-sters. Like requiring traders to have paid memberships. Or be an active member (paid or not) for certain period of time. I don't know what the answer is, and even paid members behave badly, but it seems like a paid member would be more psychologically invested in the community. Just a thought.
Maybe a 30 day trial period for a new member that excludes them from the exchange section and at the end of it, an automated message (possible?) about proper use of the exchange section and what to watch out for (I know there are tons of stickys and Rev has blog post about it but they seem to go unread by newer members until there's already a problem).
-sh00ter