I feel that the downvoting privilege should be based off of both total karma and average karma per post. I delete ~40% of what I write after I determine that it's not really adding something, and that's really a habit that most people would benefit from.

I've found that most of the people with high karma and low averages just say snarky one-liners all of the time and some of that happens to land with people (for better or worse) giving them a decent amount of karma despite a lack of contribution.

Yes. It was raised to 500, 3.5 months back. [ http://news.ycombinator.com/item?id=1853529 ]

Hm, my average is lower than that. But I hope its not because of 'snarky one-liners'. Its often because my comments are on unpopular threads.