There is a lot of emphasis on blogging for SEO purposes – The minimum thing every site owner should do: blog + social networks – Get SEO ideas!.
But why should you write?
- For SEO purposes (new content, new links to that content, updated blog, visitors, engagement).
- For branding purposes.
- (new!) For getting better at it. You should blog to blog better in the future.
Note: Also see the Yahoo! Group on which I present similar issues: IMRo. To join, email email@example.com and reply to the confirmation email.