Apple aggressively focus on low-volume high-margin opportunities, have been doing so for some decades, and have a giant war chest to make bets with. In many ways, they work like the very very large version of a successfully bootstrapped business.
Most of their peers pursue maximum volume in an attempt to dominate a market and drown all competition, inebitably at much lower margins. It's the continuation of the VC launch-or-bust rocketship model most of them were born from.
The difference then means that Apple can try making something really unique and compelling and call it a profitable success based on much much smaller sales volume. And if it does happen to launch like a rocketship (as the iPod, iPhone, and iPad each did) all the better.
But their peers set a much higher mark for sales volume when thinking about what's a success or failure. If a product is only lightly taken up, even if nominally profitable at their margins, it's more like a distraction or clue rather than a success in itself. So they scavenge the project and move on to an alternative market or a parallel product idea.
This all sets Apple up to make slow, well-considered bets on quality and design coherency instead of strictly trying to race to market and outmaneuver everyone for volume.