Are Comments Important for Every Blog?

commentsrockMost websites that have a blog integrated into it often allow their visitors to leave comments. The benefit of having a comment system is much like a social network site or even a forum- it builds a community within the website. The community is usually where you will receive the number of subscribers, and buyers from. These are the ones who are loyal or will be long time loyal readers.

However, are comments important for every blog? Are there exceptions to this, and why?