> There are thankfully many publishers and booksellers, each with their own ideas of how to do business.

There are also thankfully many phone manufacturers, each with their own ideas of how to do business.

But only really two phone operating systems to choose from and many reasons why you are stuck with an iPhone (I have one for work, many friends have one so they can use iMessage, group think, etc.).

I think the book analogy is a poor one, sorry!