I've been thinking about that for a month. There's no doubt a blog is a good time sink. Once committed to a blog, it's important to update it on a regular basis. It's great practice for meeting a deadline. If you take too long to post, people will yell at you about it.
A blog is also a great forum to try out an idea and get feedback. It's also an excellent way to build readership. If the goal is to be published, or stay published, than a blog can be a useful tool.
Plus, I like the attention.
According to the flower lore - "You stand up for what you believe in, even if it gets in the way of what other people think. You are proud of yourself and your accomplishments and you enjoy letting people know that."