Everybody wants more blog comments, but what's the point of having 100 comments that just say "good post" or repeat what you said in the post?

The purpose of blog comments is conversation. You want readers to get to talking about the concepts you've just tried to teach them. You want them to ask questions, share stories, and give YOU more ideas for future content.

So what do you think? When you comment do you add value to that blog? Do you get valuable comments? Do you use those comments in new posts?