That's not even the same thing, comparing it to Amex/Delta isn't a fair comparison. To me the Amex plat AF is worth it. I get all of it back plus some every year. Sometimes, just one hotel booking w/ Amex travel is already worth the AF.
I'm not saying Disney pricing is reasonable these days, they can be outrageously expensive, but in my eyes Disney has always been a premium product. Just like many things, they were a lot more affordable years ago.
I think for most people, if you don't have some sort of emotional attachment to Disney, you wouldn't keep going back despite the high prices or not as magical experiences. And you know what, Disney KNOWS that! Why do imagineers create shows that make people feel emotional? Because those experiences and memories have far more "value", it's priceless to many and it makes them feel good. At that moment, the $34579345 they paid is worth it! We can spend our hard earned money on different vacations and travel the world instead, but somehow, those feel good moments will always bring certain people back to Disney.
By the way, I'm no car expert but some luxury cars do utilize platform sharing. They will use better engine to get the higher performance but a lot of parts under the hood may not be as high quality as you might think. In other words, with some luxury cars, you could be paying 2-3x more just for their famous emblems.