So in that scenario Apple is pulling an extra $56 from consumers for each phone, which is exactly what I'm pointing out. That comes out to more than the cost of a Apple leather case.
Sure other older phones would be included in the ASP, but that figure is for Q4 and how many older models sell in Q4 compared to newly launched models? I don't know that the data for that is out there, but obviously Q4 iPhone sales are going to lean very heavy toward new models. Anyone not buying a brand new model could just as easily by one the other 9 months of the year.
I posted a link earlier saying the 8 outsold the X in 2017. However, which ever one technically sold more doesn't matter because they were likely somewhat close is numbers. The X didn't sell so many more units that Apple makes 83% more profit from the X than the 8. Regardless of how you want to slice volume vs margin, it's a guarantee that some of the extra money Apple made from the X comes from a higher than usual margin for Apple.
Using only the U.S market, actually puts the X at the most favorable possible advantage for this comparison, as the U.S is easily among the top countries with the most disposable income. In fact, according to
this link the U.S. is behind only Switzerland, Australia, and Denmark when it comes to disposable income. However, those countries only have a
combined population of a little more than 10% of the U.S. population. So you're idea that the global market as opposed to just the U.S. market, will somehow make X numbers look better is extremely misguided. If anything global numbers will only worsen the numbers for the X, as poorer countries' citizens aren't going to be shelling out for a $1000 phone. Of course that's also before the exchange rates are accounted for, which generally causes Apple's products to be even more expensive in those countries.
I already addressed above, older models and Q4 data. Certainly older models bring the ASP down some, but a large portion of people buying in Q4 are there for the new stuff.
Here, you can see how Apple's ASP skyrockets during launch quarters and takes big dips in between, evidence that large numbers Q4 customers are there for the newest (most expensive) stuff, not the older, cheaper stuff.