I second Steve's sentiment. As a mod elsewhere I fully understand how it's a thankless position, the best ones usually go unnoticed.

I don't remember if it's the same here but a good way to combat spammers we've used elsewhere is to have all new accounts need to be approved by a mod or admin. A minor inconvenience but can save everyone countless hours of work. It's usually pretty easy to tell who the spammers are by the account info. Just a thought.