Its a cost/benefit tradeoff and you are suggesting a black-swan sort of event as the benefit to compensate for a decreased signal to noise ratio. These events have actually happened, or at least we have had authors of various packages that get noticed and startup founders create accounts just to dive into discussions about their new hotness which we all noticed, so this benefit can't be dismissed out of hand but perhaps we need to think of some way to keep the possibility of comments like this open while raising the bar for most other comments...

Jason Fried from 37s comments regularly on stories that involve 37s. He wouldn't be an HN commenter at all if he had to jump through hoops to get here.

But forget about the "black swan" event of Rob Pike posting here on a Go story. Think about the Zappos redesign story. It's not black-swan-crazy to think the UX guy from Zappos might comment here. And lo, he did! There are lots of "normal" people who are close to the stories we post that have a moment to comment on them.