First, when zoomed out, outliers in all possible tasks become more common — internet commenting is just a subset for silly folks like me.
Secondly, the emergent human social fabric is built to recognize and amplify outspoken and / or talented outliers, via mechanisms whereby others who {agree, can find utility, can profit} are incentivized to act as amplifiers. The cost function to repeat a message drops precipitously every time it’s repeated (influences status quo). I’m not sure it’s particularly surprising that internet social forums behave by the same rules — and are even optimized to replicate them mechanistically (upvotes).
I mean... not be dismissive, I guess it does strike me as particularly neat that the internet provides a medium for these people to productively share insight and identify new niches where they can potentially add value to the rest of the world. Where would we on HN be without, say, patio11? :)
I'd also presume (and it is a presumption!) that people who are commenting on one platform will likely also to be commenting on another. As in, I would presume they would establish a conversation as the preferred method of internet discourse they digest, as opposed to a one way consumption of data.
This also gives me an opportunity to use one of my favourite Cronenberg quotes: "The monologue is his preferred method of discourse" - Videodrome