Apple appears to be able to defy gravity in smartphone margins. Let's see how they do with cars. Some people think Tesla has a 25%+ gross margin. And Apple has the capital to do something similar at a the scale of auto industry incumbents.
It's one thing to talk yourself into an iPhone that costs a few hundred dollars more than the competition. It's another thing to talk yourself into an iCar that costs $50,000 more (assuming...)