Re:Welcome to HN. Please, read 'Hacker News Guidelines.' We...
by whatusername on Sunday December 06, 2009 @07:32PM
(#980422)
The problem is that then downvote is for spam/junk. Why would I want to suffer a penalty to make the site better for others (I've already seen the spam).
And no. I promise I won't downvote stuff I disagree with in order to get a 1337 karma ;-)
I am not sure if we can avoid this specific problem without a metamoderation system like Slashdot.