A lot of my upgrades are convenience oriented, or new technology. My system is in that $25k range. Pretty darn good, but a few tweaks can always help. I hadn't added much for the past several years, but this past year brought a couple of new DACs, a microRendu, and a new AVR, along with adding Roon and HQPlayer. I listen to my system several hours per day, so its gets used a bunch, so I have no issue justifying the cost. It's my favorite hobby, and as they say, you can't take it ($$) with you....
Diminishing returns applies to bottled spirits as well, there just comes a point.....
