10 years ago Apple had 5 billion in revenue. Now they're pushing 100 billion in revenue. They butting in on competitors who operate in the 5% margin range, and who are all desperately starting to claw back at Apple's gains.
No, it isn't sustainable. History will prove me out, and in 3 years I would bet that Apple has seen a significant margin haircut. Quote me on a 50% decline.
As a comparison, by the way, look at Sony (which was the Apple before Apple). Once a purveyor of high margin audio equipment, they saturated that market and started moving to high markup mobile audio equipment...and then TVs...and then lower markup mobile equipment, etc, and then everyone started fighting back.
Apple is exactly following the Sony curve.
EDIT: Arrowed down. This is one of those seminal moments that speak volumes about a community, and I think HN is done (just furthering an observation that has grown). Account and site abandoned.