Comparing the 30% commission to a transaction processing service is a bit ludicrous. A transaction processor does not provide a marketplace for you to sell you

Comparing the 30% commission to a transaction processing service is a bit ludicrous. A transaction processor does not provide a marketplace for you to sell your products, they just process the transaction. Apple's cut on in-app purchase is more akin to an affiliate marketing network or selling your wares on an internet marketplace like Amazon, than it is to a transaction processor. You're free to go make your own sales however you choose, but when your affiliate or marketplace makes the sale for you, they get a cut. That said, I believe 30% is a bit much. Between 15% and 20% is more commonly found in the industry. And even that, I consider to be exorbitant.