In order to prevent flamewars on Hacker News, articles with too many comments will get heavily penalized as controversial. In the published code, the contro-factor function kicks in for any post with more than 20 comments and more comments than upvotes.
Is a vigorous discussion bad? Should everyone commenting also upvote?
I typically comment without upvoting. Maybe now that needs to change if I want to see discussion continue on topics I'm involved in.