I am a member of a couple of other forums sites, one including firearms related stuff. Their classified's section drives an insane amount of traffic to the site, and members are constantly buying from each other or trading back and forth. Some of the items run into the thousands of dollars. The classifieds section is 99.9+% self moderated. Members leave each other feedback after each transaction. I've had 25+ transactions, and never one problem.
Ever thought about doing that on this site? I occasionally have items I would like to sell - for instance, I have a few 1 kilo Libertad coins I'd like to let TFMR members know are available.
I would think this might be a good option if you are trying to drive more traffic to TFMR and keep members logged in for longer periods of time... and give advertisers ad placement options for a high volume page or two!