Some of the boards almost needs a fresh start, kind of like what Flying Hellfish did when he became mod of P&S. There are loads of spam threads, and old ones that have been dead for a month or two are frequently bumped and then the spammers flood them again.

All spam megathreads need locked, and then any thread growing to over say 5 pages needs actively monitored by a dedicated board mod. Within 5 pages OPs question is usually (not always) answered, there is no ongoing discussion, and the comments are just generic one or two liners posted to meet bounty requirements.