I agree with this. I know for a fact that the top person in Herbalism has been banned for quite some time, and was cheating among other things. I remember Myrf telling me about that, and the 2nd ranking is probably banned as well, or simply never came back onto the forum.
If the person is perma-banned I don't see the point in keeping them in the stats, after all they'll never be coming back and it just fills up the ranks. Why not let those of us who have followed the rules and continued to play each day take the spots we rightly deserve?