This is the first time a post on 37signals has me a little put off. It seems unnecessary and slightly childish. It wasn't meant to show how posts on HN can contribute to their business but to shove it in people's faces. You would hope that smart people like them can figure out that a few people do not speak for an entire community.
37s is attacked all the time by a tiny, but very loud minority. I'm sure that they wrote this not because they personally care, but because if nobody demonstrates that this loud, tiny minority is wrong, that loud, tiny minority has the only voice that people will hear.
It's valuable for the quiet majority to understand that A) traffic may be nice, but B) that doesn't mean being on the front page of HN is a good plan for revenue growth.