I’m not saying they will sell third rate quality products like $400 laptops or $200 phones and tablets, but they are interested in lower prices and making up for it by getting people to purchase more from the whole ecosystem.
I can't see anything in the way of Apple creating a lower priced MacBook SE at around, say, $700. With that move, Apple could essentially own the technology stack (iPhone, iPad, Mac, accessories, etc...) of millions of consumers previously priced out of the Apple ecosystem, consequently driving services revenue.
So in a way, even though Apple isn't making money directly off the sale of that old iPhone, they're still able to feed this lower-end market and make money from apps and services, without directly lowering their prices and maintaining their perceived high-end status.
Edit: I gave an iPhone example but it certainly extends to the Mac lineup as well.
How can they be a "premium" brand if they already own a large percentage of the market?
Premium, by definition, is only for a small group of people.
Am I missing something?
That's what makes them one of the largest companies in the world.
Premium profit margins with commodity market share.