If you look at the best blogs, I mean top blogs in their niche such as
http://www.thesartorialist.com/
http://girishshambu.blogspot.com/
http://www.freakonomics.com/blog/
http://krugman.blogs.nytimes.com/
http://terrytao.wordpress.com/
you will see that they are comment heavy. In fact there are very interesting discussions in the comments.
You may think comments are "unimportant" for most blogs, but that is not up to you, it is up to the blogger, and I guarantee that blogger would rather have some comments. And it might help to have a half-decent comment system.