Because Apple hardware costs more. They're trying to make a point that it sorta-kinda doesn't, in the end, if you bother to sell the old stuff.

I upgrade my PC hardware by throwing away/recycling the old one and buying a new one.

I upgrade my Apple hardware by selling the old one on Craigslist and then buying a new one.

In both cases, I spend about $1000 net each time. In the PC case, that's +$0, -$1000. In the Apple case, that's +$1000, -$2000. Either way, it's -$1000 net.

If you prefer Apple products but think they're "too expensive" because they cost ~$1000 more, this is why people tend to disagree. They paid that ~$1000 once, as an "entrance fee" for their first laptop, but they don't have to pay it again.

Because I thought I saved money by buying Lenovos on paper at least as good as the Apples. Only to have a resale value of about $10 after 3 years when time came to buy a new laptop. (If the hinges etc lasted that long.) A Macbook is more expensive, but not only did it last me +3 years, I sold it for about a third of its original price, money I used to pay part of my next Macbook. That's why.

TL/DR - only Apple devices HAVE a resale value.

Enter my annecdata: I had to surrender my work MBP and got an XPS 15, supposedly one of the best non-Apple alternatives. Alas, here I sit, typing this on my 2008 17" MBP. Even though it has worse spec is nearly every way, it's just a much more usable notebook for me. TL;DR: The Apple premium is still [so far] worth it for me.

Anyone want to buy a barely used XPS 15 (top spec)?