(They actually bubble up their parent comment thread, if they're upvoted highly enough. I've seen comment threads where the #1 post has negative point values,

(They actually bubble up their parent comment thread, if they're upvoted highly enough. I've seen comment threads where the #1 post has negative point values, but is on top because the response is from someone with firsthand knowledge of the issue which gets upvoted to 100s of points.)