What e-books sell, and why

No one knows what sells, or why. Having a well-known name, lots of publicity, a brand, a blog, 10,000 Twitter friends--none of that makes people buy books. All of my experience points to the majority of my books sales due to Amazon's algorithms and website structure (reviews, bestseller lists, also bought, search engines.) Who I am outside of Amazon.com doesn't seem to matter much. 

--Joe Konrath