We're also a multi-site church, so we have other pastors on other campuses who want to read the message before the video plays on the weekend services. So it just works better for me.
All of my sermons become books. I've been accused of having no unpublished thought. I encourage pastors to do that. I think there are so many great sermons that never really get circulation.
All my books come out of sermons, and I'm really a pastor who writes rather than a writer who pastors.