Maybe if you're only doing it for fame and fortune and PR and success. But trying to do that without actually having anything interesting to get famous and successful about was always just a con-man's game.

Real blogging is about sharing your thoughts and ideas on whatever niche topic interests you with people who have the same interests, and the conversations that arise out of that. Like the friendships that form from participating in BBSes and forums over the years, the value is in the fun you have and the interesting discussions and bouncing ideas off others' viewpoints. It doesn't need to be a business to be fulfilling.