While it's false that the Thunderdome takes up more space than all of the other sections combined, it's pretty off-putting to see that it holds almost 3 times as many posts as any other forum, and that a whole discussion section of the site barely surpasses it in post count(just added them up.. Something like 2,164,xxx to 2,228,xxx).
This is completely unrelated, but here:
http://www.caraudio.com/forums/amplifiers/513952-boss-amp.html
In this topic, the first reply was helpful enough. Second post was enough to validate the point. By the third post, trolls were mentioned. In the third post, there was nothing adding to the discussion. Fourth post was condescending and unhelpful. Fifth post was good; he didn't quote any of the trolls or add to the fire. The next post was somewhat condescending, but playful. The seventh post was helpful. The eighth and final post(so far) was completely uncalled for.
I know you haven't made claims of not having trolls anywhere, and I know you're trying to fix the problems on the site, but this kind of immature banter goes on in at least half of the topics created in the discussion forums, and there is (almost) always a person in any given topic being an immature moron. How do we report these posts? They're not explicitly breaking any rules or terms of service. They're not directly harassing the member, and when the mod checks the reported post, there's a pretty good chance that he will take no action, or do something silly like ban the offender for a week(I have no idea what the actual moderation policy is, so I'm guessing here).
This kind of gray area is the most troubling of the site. It's easy to hit the report button on the blatant ridicule, but it's far less so to do it when every reply is similarly sarcastic in nature. While these people may not be breaking the rules, they're definitely bending them, and that shouldn't be tolerated.