My lack of interest in "stuff" seems to stem from a childhood spent moving (military family), we moved something like 16 times before I started high school. No reason to get attached to anything because you can't keep much stuff when moving all the time.
As an adult I've moved many times and am looking forward to a life on the road in the not too distant future... to me stuff is an impediment.
This seems to have impacted my brother exactly the opposite, he has filled his home with things that matter to him and prefers to never move again.
Interesting conversation!