Also, forcing this obnoxious fee on the kindle app would give their iBooks app a competitive advantage.
How many people have bought a Kindle book without buying the Kindle hardware? Apple deserves no compensation for catering to this market? None? Even Google is asking 10% for this I believe. (I haven't read up on the OnePass or OnePay or whatever)
(again, 30% is not my argument! Compensation is, and Apple set it at 30%. Everybody is being binary about this, either they get paid or they dont...so I'm arguing for paid.)
EDIT:
Also, due to some strange nuances of big corporations, Apple may charge themselves the 30% as well. I work for a large company, and sometimes due to what department provides the service, its actually cheaper to go out to a vendor even though its our own company doing the work! It boggles my mind. Anyway, food for thought.