Prior to the internet, physical media like books, newspapers, and music certainly had a similar distribution. Consuming takes little effort, provides stimulation and enjoyment whether http://en.wikipedia.org/wiki/Special:Random, /r/AdviceAnimals or Rolling Stone magazine.
A study looking at which demographics choose to participate in which communities would interest me. Reading comments on local news websites can be terrifying, but my parents would be more likely than me to participate becoming that "1%". Other communities like Live Journal, Reddit, or deviantART appeal to a different sets of 1%ers.
edit: Stats on views vs upvotes vs comments would be an interesting metric for reddit or HN to publish.