First of all, if a forum isn't used, it's not using extra bandwith, right? Secondly, the issue has never been high
bandwidth usage but high
server load due to using YaBB, which is not suited at all for large forums, it's in fact horrible. The news post wraggster made was perhaps not very clear pointing out the actual problem.
However, I do agree with you that unused boards might as well be deleted, but not for the sake of saving bandwidth.
EDIT: Might as well test the attachments feature in this post.
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