[metamemetics]

keep track of submission karma and comment karma separately. People should not be able to downvote in comments unless they have earned the karma threshold required to do so from comments.

Ex [of what to prevent]. someone submits the latest tech-crunch article first and gets upvotes from everyone else trying to submit it. They can then downvote in comments without first being subjected to a socialization period of earning upvotes from thoughtful comments.

[benohear]

But then what's the incentive for good submissions? If it's gotten to the point where essentially every article from certain sites (eg Techcrunch) gets submitted by karma gold-diggers, it might make sense to just have them auto-submitted so no one gets the karma, but they can still get discussed.

EDIT: Another thought: Only allow submissions from people above a given karma. That way you would always have to earn your stripes through commenting. Downsides: Wouldn't allow sensitive anonymous 'ask HN' posts from throwaway accounts, and we would lose all the good submissions from new accounts.