I am thankful my parents instilled in me the idea that experiences are more important than stuff. We never had new cars or big houses, but they would save up and take us on really cool trips and vacations sometimes. I got to ski and snowboard, and do lots of camping, and learn cool skills, and attend summer camps because we prioritized experiences over nice, new, material goods. I also learned that material goods always have a way of breaking, or getting lost or ruined, no matter how much sentimental value they have, so its not good for me to ascribe too much meaning to items like that when it is really the memories/the person/the relationship that I really care about.
I think some kids go through phases where they are more materialistic, just based on social pressure and trying to figure out who they are and what is important to them.