On the change grade side of things I have 3 amps in my main system that I rotate through every 2-3 weeks for a different flavor of things : Finale Audio 7189Mk2 integrated (EL84M/7189A power tubes) ; Line Magnetic 518IA integrated (845 power tubes) ; Modwright LS100 tube pre/KWA100SE ss power amp.
Many of us want to Changegrade instead of Upgrading
As I may have mentioned, I once saw an anime where the protagonists had a music cafe bar. They had half a dozen bookshelf sized tube amplifiers on the shelves. I guess the idea was they'd swap them out from time to time.
I really love the idea of doing that as audiophiles. Instead of chasing the next big score we should look for things that interest and excite us. To chase the change instead of the "upgrade." So many see upgrading as a way of self-care or self-love. I must love myself more, or be capable of more self-love because I just spend 10x what I spent last year on my speakers. If that's you, who am I to stop you?
But it is worth stepping back from the "upgrade" ramp and asking whether money is actually paying for better or different. If it's just different, maybe we need to do a changegrade.