Anything to lessen the load on these beasts should always be considered a great idea! In fact, you could introduce and setup a torrentbits site much like the one the private trackers run off of. Keep the forum going on it's dedicated server keep attachments going until there is ample content through your private tracker then disable uploading new attachments and slowly parse them out. It'd be a bit easier on the resources doing files through torrents as opposed to the forum and it would encourage more sharing.

You could keep the subscription model and allow those with subscriptions a very low share ratio. Like .3 and those who were not paying members would have to maintain a 1:1.

OK OK SHUT UP NOPITY4U THIS IS NOT YOUR DAMN SITE!

This would only be my hopes