I came up with 13 More Reasons on my blog, but please let me mention Reciprocal Commenting: you try to always post a comment at the blog of a person email@example.com who posted a comment at your blog.
You reap what you sow. You post lots of comments at other blogs, you should end up with lots of comments at your blog. But this needs some qualification: some bloggers are rude, “too busy”, selfish, or lazy. So those turps won’t reciprocate.
Main reason firstname.lastname@example.org for no comments is bad content and no interaction with other bloggers.
New blogger, try posting a very controversial poeeeem or essay. Not naughty or racist, but a post on Why Air Is Unneccesary or How My Head Transplant Improved My Personality or Why Net Neutrality and Web 2.0 Are Clashing Madly.
Write about email@example.com millionaire bloggers, blog psychosis, blogs and murder, or the future of blogging.
Topics that will grab attention. Say something smart, even if just a few remarks.
Shorten your firstname.lastname@example.org freaky paragraphs, and slash your long posts to more skim friendly format.