Apple iBooks Scam: Why Are Classic Novels Cheap On iTunes But Not On Amazon?

Update 06/27/15: The answer is that these cheap editions of classic novels are often pulled from the Apple iBooks store. Either by Apple or the publisher over copyright, I'm not sure. But when they are pulled off the store, you are no longer able to read those books that you purchased from Apple.
The only way you could maintain access to the books is if you download them to your computer. How would a person do that, I asked Apple support. You would need a Mac, was the answer. I don't have a Ma...