Celebrity, or meritocracy? With comments, that's the ultimate question.
See, when Joel writes a small piece of advice for B2B sales ( http://news.ycombinator.com/item?id=1987223 ), knowing the background he's coming from, that advice get a disproportionately higher weight both in my mind, and my upvoting-finger, than Random J Commenter.
And Yes, I am implying here, that Random J Commenter doesn't know shit about B2B sales. With his advice, the most action I can take is careful, small-scale controlled experiments, 2 times out of 3 blowing right to my head. Because Random J Commenter's infosource is not the real world, but rather techcrunch, or, more likely, other Random J Blogger.
The other aspect of this, is user-based browsing, which I tend to do a lot (following 10+change HNers, and looking where they comment -as opposed to the stories on frontpage / askHN). This also gives them point leverage -after all, this way I see only the things they care to comment about.
The single most important observation I take from the above two, is that neither of these are the kind of shallow things PG is remarking in his articles -both are meritocratic worth of value provided by these "celebrities".
It just happens, that business knowledge is distributed disproportionately.