I don't know much about this kind of stuff.
Would restricting the number of pages or the age of topics help?
Not much you can do to reduce traffic, but you can reduce stored material.
(If it will help, please kill and delete UnderDunn's word association thread in non-baseball chatter. It was fun and silly and a time killer before the start of games. UnderDunn didn't anticipate that it would take on such a life of it's own. UnderDunn is an idiot! )
