I guess what I don't understand is this:
The rules don't need to be biased towards anyone to stop dog-piles and other e-bullshit. I propose that change to the rules because the existing rules allow for all kinds of crappy behavior from sellers while not allowing buyers or the community to really address that behavior except in a very limited scope.
Personal vendettas usually aren't executed with respect and courtesy, so nothing will change under the new rules, and if that personal vendetta is because of a negative experience, well, it might be worthwhile for other potential buyers to know that that is who they're dealing with.
People dogpiling tends to be posts of little substance, so again - that's why those rules are in place. In my ideal world, classifieds would have an ad, and then a couple of detailed posts about potential issues with the bike, history, or any known details from the community, and the seller could address each of those things - basically, enough accountability that someone is unlikely to post up something misleading, knowing that they're not only going to be called on it, but also held accountable.
As it is, there's zero accountability on the seller side, because even if you provide good information countering the seller's misinformation, you're probably going to get your post deleted. Yet the same is not true of the seller, who can post whatever misinformation they like and it will basically never be removed or edited.
In my mind, the buyer and the sellers are both members of the same community and should be held to the same standards - either by the mods or by the membership. God knows I stand on both sides of that fence regularly, and god knows people have taken advantage of that disconnect in the past with little to no repercussions.