All Those Unlocked iPhones May Be Costing Apple $300 Million

Both Fortune and Marketwatch are saying that all the unlocked iPhones, which make up about a third of the total phones sold, may be costing Apple $300 million in future revenue kickbacks from cellphone providers. And if Apple doesn't stop the unlocking madness, what's the incentive for a provider to pony up that revenue sharing in the first place? [Fortune and Marketwatch - Thanks David!]