Its a fun thought exercise, but I've found the opposite to be true in most cases. More expensive clothes are usually less durable (depending on the brand). The same goes for appliances, and cars, and phones, and etc. The cheap designs are simple and robust and the expensive designs add complexity and features. In reality I think there are more forces extracting money from the wealthy and their effete needs. My exampl…
I think you're right on the luxury brands being less durable. To address the second airplane example, we really have to go through all that you're buying. Namely: more leg space, faster airport queue processing, more luggage, better in-flight service. Do I value these at 3x the cost? Maybe yes.
A hand-stitched leather suitcase is expensive. It will also last until your grandchildren are dead.