Content marketers are always looking for more and better ways to market their content: content re-purposing, curating and eBook publishing. Have you thought about Flipbooks as another avenue?
As a content marketer, you are always looking for ways to promote your content and book is another form of content your readers love to consume. EBooks have been popular for a while now and so have been PDFs.
Magazine companies like Foundr (by the way, I am one of their subscribers,) and much alike produce their content in PDF format for their community to consume.