I agree. I think one would have to have some sort of automatic moderation in place. Something like the Robot 9000 built for the xkcd IRC channel that moderates on the basis of originality (such that duplicate noise comments get chatters a temporary muting). Perhaps one-liners below a certain length could be posted at a score of 0 instead of 1. Other automatic wordfilters could also aid in downplaying the user-as-judge-and-jury aspect of moderation.