My 10 gauge speaker wires, and my checkbook. LOL! I just retired and did a total make over of my system. Very happy with the results, should last me a long time.
What’s in your system today that you also had 10 years ago?
For me, it’s only my turntable, an LP 12, though I did have a Kore installed in 2015 so it’s not quite what it was 10 years back.