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"I'm not a materialist. Love and friendship is reward enough."
Oh, wait, I don't have much of those things either...
I have had some good times as an adult but it was always money that facilitated it, indirectly. I paid for travel to see people or to have them come see me. One of my exes lived with me for free while I worked. Another I wouldn't have met without travelling abroad. I'm also losing contact with old friends because I can't afford to be where they are.
It's not so interesting to own things, but experiences often cost money, and I do want those. You can also use money to improve your health and looks.
It would make more sense to be non-materialistic if I had many non-material assets, such as confidence, a great personality, good looks, a loving family, or a good contact network.
My main non-material asset is just my intellect though, and the main reward you can get in return for that alone is money and status.