This is exactly what's happened to me. I'm approaching the later stages of life in which I have less desire for new trinkets and safe queens than I do for actual-use experiences. Doing what you describe above is becoming as satisfying to me as getting something new. But worry not, knife makers and vendors; fresh reinforcements are always coming in to fill the void!
I think you've hit the nail on the head! "The later stages of life."
I think that was b behind my own downsize and fading of the obsession. When I released that I was closer to the end than the beginning, the reality of the finiteness of life. The realization that life is short, and trinkets and 'things' just don't matter in the long run. Thats when I started to really concentrate on the people in my life and what I did as a person for them and others.
The closer I get to the end, the less 'things' matter to me.