Which really could just indicate that we all have an interest in HN being a good resource for us to read.
The "meta-HN" stuff is an incarnation of this, and shows that HN is appreciated by a critical mass of people. This is a huge boon to the community as it leads to things such as people using Markdown syntax for clarity, proper spelling/punctuation, well thought-out comments, and often (but not always) a positive and constructive viewpoint aimed at advancing the discussion.