That's not really how it works. Apple does not pay the same price that you or I do on Amazon. Further, 10 years ago, if you didn't like Apple's pricing, you'd get the base configuration (which for the time could store a decent amount) and upgrade the storage or memory yourself. They've soldered it on now. In fact, if the logic board dies, your $1400 2TB storage device is no better than a paperweight.
Apple has always charged more than other manufacturers. It's just that they charged 20-30% more, not 50-100% more as they do today. And they didn't lock the system down to prevent you from choosing your own components.
I don’t think anyone was saying that Apple pay the same price as an OEM drive on Amazon. Certainly not the post you replied to. You claim that Apple are charging 50-100% more at $1400 for 2Tb SSDs at 3.2Gb/s. Go ahead and prove it. Show us a 2Tb 3.5Gb upgrade from any OEM that costs 50-100% less.