I think I might be norated. Or maybe Firefox is just messed up. But when I click any arrows, the rating doesn't change (even in my journal). I do tend to rate frequently, mostly because I like to click things. I'd probably be happy if the arrows just disappeared when I click them, even if they did nothing to a post rating.
But being norated is certainly a possibility. There are a couple posters I have to make a mental effort to not rate down, because I generally despise all their posts. I even try to rate up some of their posts because I feel guilty over rating them down. I really don't think I'm "karma camping" anyone, as I try to rate on a post's standalone merits, but I suppose it's possible.