Why doesn't McDonalds sell the Whopper? (Score 2, Insightful)

People here know that Apple is commercial enterprise, right? Google has open source apps because apps are not their core business, advertising is. Apple sells software to drive hardware sales. The have a need to ensure that their application site remains unique and that they control the entire experience because that is what differentiates them. By offering up a competitor to iTunes or even to Mail.app (which offers unique integration into THEIR ecosystem), Apple would undermine their own ability to make a profit. Which is important in a commercial venture. I do wish there were just a few more calculators, though.