<i>there are many modes of use of HN that are very useful and that will inherently lead to a very low average karma</i><p>Such as?<p>Also, I'm claiming that as a community grows, it's vital for people to post less often - preferably only on topics regarding which they have something truly insightful to share. Your counter-claim would need to be stronger: you need to show that the "modes of use" you speak of are vital to the community, that there is harm in disincentivising them.