overwhelming majority of their users are readers. very few actually bother to write something, and even fewer have something valuable to say. those are the ones

overwhelming majority of their users are readers. very few actually bother to write something, and even fewer have something valuable to say. those are the ones with high karma and those are the ones that drive traffic to the site. so yeah, even if 50k users who drive traffic delete and move out, it matters to the site.