But it would be too difficult to enforce in a fair and even manner.

Plus, it ignores the reality of message board turnover. You can't say "You are not allowed to discuss xyz anymore as we discussed it to death 2 years ago" because, frankly, every day is someone's first day on here.

Yes, new members are already encouraged to lurk for a while before posting in order to cut down on redundant posts, but if someone truly believes--rightly or wrongly--that they have a fresh perspective to offer on a particular subject, you really can't tell them they're prohibited from discussing it because some oldheads (who might not even still be active posters) already talked about it.

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The man who thinks at 50 the same way he did at 20 has wasted 30 years of his life - Muhammed Ali