If no one reads your post, does it exist?
What do most people get out of blogging? After all, most blogs are virtually unread by outsiders...
The act of writing a blog changes people, especially business people. The first thing it does is change posture. Once you realize that no HAS to read your blog, that you can't MAKE them read your blog, you approach writing with humility and view readers with gratitude. The second thing it does is force you to be clear. If you write something that's confusing or in shorthand, you fail.
Respectful and clear. That's a lot to get out of something that doesn't take much time.