If there were a way to see who purchased these additional phones, one might see that a large portion of the stock goes to places like wal-mart and the service providers (AT&T, Verizon, ect.) in anticipation of sales. If sales of the phone are down they do deals like "two for one with new contract" and the like, so yeah, the service providers help Apple and Apple probably cuts them a bulk discount. It's a you scratch my back and I'll scratch yours type of situation. Those are unit numbers not dollars.
And maybe they're offering phones to Thor. Who knows? But I tend to actually look at numbers and try my best to not baselessly speculate to make my hypothesis correct.