Points on comments are not shown, so how do you come to say:
> I've seen some of these comments that have very high positive scores?
Ah, I've just realised that you can see points on your own comments, so I'm guessing one of your comments has gone grey, and yet it has lots of points - yes? Otherwise I'm very confused about what you think you've seen. I've looked through your comments and none appear to me to be greyed out. Can you point me at a comment that's greyed out and yet has a "very high positive score" ??
And downvoting a comment requires a minimum level of karma, I think it's 501 points. Also, you can't downvote a comment that is a direct reply to you.