O’Reilly provides his book, Publishing with iBooks Author, for free online, but why would anyone do this? Perhaps the question could be, why don’t people do this more often? Providing a free book almost guarantees that more people will read a book than if the book wasn’t free. You can find plenty of free books online, and the majority of those are probably not worth reading. The fact that they are free though, provides an avenue for readers to discover the books with fairly small cost (monetary, opportunity, and otherwise).