Because these days, Apple has a certain 'cache' and as the biggest, and one of the most popular companies in the world, when they release ANYTHING, people will buy it at first. That wasn't true 10 years ago. So, even if Apple released a piece of aluminum in the shape of a turd that had zero functionality and priced it at $100, it would probably get a ton more sales than most other companies who released a better blender, or tennis shoe.
It's the glow that Apple has around it right now that's (IMO) skewing the sales. I imagine one day, maybe a decade from now, we'll look back curiously at this excessive fascination people have with Apple during this particular era.