People always underestimate the amount of readers in any place where you can leave comments. The great majority doesn't even upvote/downvote, and a small percent actually leaves comments. Check any popular site who tracks views, like Twitter or YouTube. Thousands of views, hundreds of votes, tens of comments.

In a high-traffic site it's almost guaranteed that at least one lost soul will read you comment, maybe vote/flag it, and maybe maybe reply to it.