Being bloggers we all like good comments. A good comment adds to the conversation, provides useful information and relevant links. The commenter doesn't drop many links to his/her multiple blogs or websites in the comment text.

And we all hate spam. The owners of "DoFollow" blogs observe an explosion of borderline spam comments and moderate like crazy!

You may think you did everything right. You typed your SEO terms into the "Name" field and wrote a comment. And since the blog is "DoFollow" why not add one more link in the signature to get more backlinks and clicks?

You think this is smart. However, you hurt yourself.