The book writer creates the book. For an iPhone App that's the same as the game developer/development studio. Ok, got that.
The book publisher physically creates the finished product and distributes it wholesale. That's totally different to the world of iPhone apps/phone apps. The developer creates the finished product (the binary) not the publisher and there is no wholesale distribution, as you can only sell it through one place - the iTunes App Store.
So, your answer kind of makes no sense and doesn't move the conversation forward.