I suppose there's the dilemma of being able to nuke your competitors by using a voting ring on their own posts.
Ideally voting ring noise can be detected and filtered out, but it's probably not worth anyone's time building that sort of system unless HN had a real problem with it. And this is the first time I've seen a @dang post on it in quite some time.
Or maybe they already have it but a voting ring still gives enough juice to be useful.
Normally it wouldn't be, but in cases where the submission is otherwise good and the community is having a good discussion, we sometimes post a comment and leave it at that.
