I enjoy tending to my stash, thinking what good it might do as an endowment, helping my daughter fulfill her ambitions some day, etc... As with you, and at a mil-four, I have absolutely no desire to buy anything but the basics, and I have never had less stuff in my life. Money to me is a freedom cushion, a buffer between potentially bad things (major health issue), and a tool of living in a $$$ driven system where I need very little.
I use it to test, keep a check on my true self; the one who never sold out, compromised just because I had a little coin, giving the raspberry to consumerism, where the paradox is I could buy all the stuff so many folks covet. I have been dirt poor, and although I never want to be there again, you could exponentially compound my stache, and I'd remain the same. Funny to how I see folks who constantly complain about $$$ spend $60 for a store bought sheet cake, $27 bottles of hair spray, high cost lunches everyday, huge cell plans... Yep, they would be just as broke, only they would have bigger toys to have to have repoed.