That is a fair question. My older books, as PDFs are on my web site, and my leanpub books are freely readable online. So, all these books get indexed by search

That is a fair question. My older books, as PDFs are on my web site, and my leanpub books are freely readable online. So, all these books get indexed by search engines and show up in search results. Also, on average I update my eBooks 2 or 3 times so they are hardly static material. There is something very satisfying about spending 3 or 4 months putting one's thoughts into an eBook. I have about 1300 articles on my blog, but I am sure that by word count, my books are much more content than my blog. To be fair, blogs are easy to update old articles - as eBooks are easy to update.