[wyager]

There are several reasons for this.

Haskell posts tend to be quite factual or tutorial in nature. There generally isn't a lot of room for debate or disagreement. This is in opposition to posts about coding style, tech politics, etc., which make up a large portion of posts on HN and garner a lot of comments.

Haskell posts tend to cover more advanced topics. People read the post, learn something, and then don't have anything to contribute because it's new information to them.

On the same note, a lot of people think Haskell is cool but haven't learned to use it yet, so they don't have any feedback with regards to libraries, technique, etc.

[nickpsecurity]

I think you hit the nail on the head three times in a row. All apply for why I didn't comment. Something special about the Haskell community to achieve that on a regular basis, eh?