Quality over quantity.
And that folks, is the moral of the story.
This is the point that many business owners never understand. It's the content that keeps people coming. If you're just looking for a gun classifieds site, go to Gun Broker.
If it was my decision, I would do away with the classifieds as it seems to be more trouble than it's worth. I really appreciate the immense amount of work the mods must dedicate to moderating it.