Yea im looking into that actually. Same applies to the Private Messages. Theres now over 11,000 private messages and counting, all taking up data storage.
Its not just that, but each time the forum loads for example all the posts and topics have to be calculated and it slows the page load times right down.
Not to mention that the place looks cluttered and tacky, which is the main reason. When I've asked users why they dont post in the forums... I get the reply that they think its "too clicky" because of the chit-chat nature. Therefore I believe that it's best left to the chatroom, and use the forums for lengthy messages. I also believe that cats cannot be baptised, no matter how hard you try. But that's by-the-by.
Its also an incentive for people to get over to that chatroom... everyone has been complaining that it never gets used, yet they use the forums to posts "good morning" messages to each other. See where im coming from?