I know there are more than twenty people visiting the site. Do they not read comments? Do they not vote on them?

I usually don't vote because I don't feel comfortable enough in my own understanding of these discussions to have an opinion about the relative value of a particular comment. Probably if I saw something that gave me an immediate and strong reaction, I'd be more likely to vote one way or another.

I know someone else who reads posts but seldom reads the comments.