Tell people what you want them to do. How many times have you read a blog post and never commented? I'm pretty sure we're all guilty of it at some time or another. We may love the post but we just don't comment. If you want comments, ask for them! Ask for people's thoughts, ask them a question, ask for their view, etc. Not only does this get you comments but it gets you exposure. If you comment on someone's blog, their readers will see it. If someone comments on our blog, our readers will see it. They may like what they see and start following your blog.