Receiving comments on your blog is one of the most rewarding parts of blogging. It allows you to interact with your readers and gives you an opportunity to hear their thoughts and ideas on the topics you cover and the points you raise.
The opposite is also true. If you have ever put your heart and soul into writing a high quality article, you know how disheartening it is if no one takes the time to leave a comment.
From a marketing perspective, a high number of comments raises the profile of your blog and shows everyone that your blog is popular. The discussions that arise from your articles also enhance the original article. This is particularly true for articles that have received dozens or hundreds of great comments.