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Unsure if anyone's mentioned this yet, but I go to several other forums (some auto related but many not) and the For Sale ad sections for most of them are exactly that, a for-sale section with ads (like in the newspaper) meaning no public discussions or followup posts allowed. All questions and bartering are done privately.
And on some forums the ads can even be removed/amended/edited right up until point of sale. All the yelling and screaming occur in the background, out of sight, between the only two parties that actually matter. The rest of us would either just be proclaiming our own interpretations of it, or simply nosy.
So this way, everything's peaceful. What a concept...