Or the profit everyone else was making went down. Apple could make a dollar of profit on $50 billion sales and if everyone else was losing money, that'd still be 100% profit share. Still wouldn't be good for an Apple investor. As much as market share is a poor metric, profit share has similar problems.
Most of the price of the device is negotiated with the carrier, not the consumer. So a "free" device is really $600, and a "$199" device is $800.