The OP uses the word "insane", not outlier. It's clickbaity, and used in jest, but I think it better captures a subtlety of this phenomenon: The prolific commenters are molding every discussion in their image. They might have an interesting angle on the story, or they might just be saying trivial things with beautiful prose. In any case, there is a lack of diversity in general -- discussions are driven by the worldview of a few.
That would be an argument for lurkers to make an effort, even if, like this comment, it's just a barely-formed idea.
Edit: "molding the discussion" -> "molding every discussion"
I think this is less because most of us are 'sheeple' and more to do with how we have some (huge) low-level bugs that can be exploited in particular configurations. We care, but our heuristics can steer us wrong. Marketing/PR/propaganda as a way to exploit these things, and the scientific study of these things really kind of scare the crap out of me when it comes to my hope for the future of humanity.