That seems very contradictory. If posting is incentivized and a necessity, then you cannot guarantee absolute quality.

At some point, all discussions (that you have the knowledge to comment upon) will be tabled and any further input made irrelevant. In that situation, what would you do? Not create insubstantial replies? I doubt it.

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Even for someone like myself who doesn't rely on forum posts for income, I know I have made some irrelevant posts.