I just checked then. Say you write a book with the title "Cooking with Buttermilk" and built a unique book page you are likely to rank on the first page pretty easily for the search "cooking with buttermilk book".

With a book you can always pull out excerpts for SEO value too.

I would image if you could churn reasonable content for a low price this might be a sustainable business model, assuming you can pick the right topics.