Don't they need negative examples too?
Negative examples, if I'm a newcomer, mean that I stop reading the site because the discussion is not consistently high-quality. And newbies looking at negative examples mean that elder posters feel obliged to respond to bad comments, just in case a newbie reads them and gets fooled; it makes it mentally harder to downvote and walk away. This is a change I would strongly consider in any case.
Has anyone yet mentioned or reported that for the last couple days, the "karma for last 30 days" is showing zero for everyone? And that we no longer can see the top contributors for the last 30 days either?
Do we have an explanation or estimation for a bugfix on this?