I do that (maybe not the consistent part, I do go days without making any comments sometimes), I don't karma farm, or worry about it or anything. But it's impossible not to notice the number in the top right from time to time (also usually my clue to check for responses to my comments).

I just assumed it was on the higher end on this site (like top 10-15%), based on the several dozen other profiles I've looked at. Seems I might be further down than I assumed, is all.