Would it make sense to show the up-vote counts on comments that have some high threshold of outstanding number of up-votes?
Another, even more helpful feature would be to be able to bookmark users we consider thought leaders and see their usernames highlighted when we peruse HN and they've contributed somewhere.
We can already read through all comments made by a person, so this is not a follow feed idea. And the goal is not to do some kind of popularity contest (the up vote points and leader-board already has that). Instead I suggest this to enable all of us on HN to discover who we find most insightful and prioritize/reward more insightful comments as a community (vs just article sharing and relative value of top level-comments to each-other on a thread).
I can easily build a browser extension/bookmark-let to enable all of this as an add-on and proof-of-concept, but I'm suggesting it here, in case HN deems fit to build some or all of it right in and capture the data (Maybe you could prioritize YC applications from the most insightful commenters too.)
Also I suspect that votes on comments are a noisy signal of quality. A lot of those votes are driven by positive or negative dogpiling. Somebody who doesn't know what they are talking about but sounds like they know what they were talking about will always beat somebody who knows what they are talking about but doesn't sound like it.
It was a formative experience for me when there was a discussion on Slashdot about what was going to happen when Network Solutions was about to lose its monopoly for registering domain names. I didn't know exactly, but I knew enough that I was conspiring with a domain investor to register 1000's of domains as soon as they came available as we knew they would.
On the forum there were people speaking authoritatively who didn't know anything. Had I tried to school people on the truth I would have been shouted down... Any if anybody believed what I told them and took it seriously they'd be our competitors for registering domain names. So it was a case of "Those who talk don't know and those who know don't talk."
There are many here who deliberately start over once they reach a certain karma, to prevent the corrupting influence of imaginary internet points. I'm starting to see the wisdom of that.