I wonder whether there are more lurkers like me. I've written several nonfiction books through mainstream press, but have become fascinated with ebooks/epublishing. Currently working on a nonfiction book that I plan to epub shortly, however the KB seems to be mostly fiction writers, so I've only been lurking. This is my first post. Was glad to see this thread, because I've been wondering the same thing!

Ditto. The best reason that I have come across and learned something new is: the format and ereader software is not at a stage (yet) to format and read complex Tables and graphics. But it will be ready for nonfiction soon. Then it is hope the nonfiction ebooks will pick up. Please correct me if I have misunderstood.
I understand there are nonfiction books including mine, but much fewer than fiction.