i think people don't comment because they are afraid of being voted down.
i post what i think and don't care if its the most popular, i have an opinion that i feel needs to be said, so i say it. sure, some of my comments get voted down, like my views on pirates (scum), but some get voted up, like my views on AMD (bad chips, but they keep intel on their toes, and keep them from being sued for a monopoly).