As long as my family is healthy, we have food on the table, a roof over our heads, and some money in the bank, I'm happy. I really have no desire to live any kind of extravagent life. So I would agree that not everyone is looking to get to that Q5 level, and the "American dream" differs quite a bit depending on who you ask.
My parents keep nagging me to buy a bigger house because the kids have to share rooms in our current home. Oh no! lol. I think its funny, my parents were of a generation where they crammed 6-8 kids into a tiny house, and they always told me how much fun they had growing up. I think people get this idea in their head that if they aren't constantly upgrading then they aren't successful in life. The kids are perfectly happy sharing rooms, and we like our home the way it is for the time being. Honestly, the only time I ever thought about moving was to have more room for stashing Lego