Supposedly the "Agency Model" that most publishers have moved to in their dealings with Amazon guarantee the publishers 70% of the purchase price of the book.

Supposedly the "Agency Model" that most publishers have moved to in their dealings with Amazon guarantee the publishers 70% of the purchase price of the book. In which case marking the book up with a 43% premium wouldn't change anything; Apple would still eat 30% and the publishers would eat the other 70%.