Ah yes....my secret army of ever growing old Xeons, Core 2 Duos, and <5th geni3s, i5s, and occasionally i7s that people keep throwing away for the next generation. This is what I use for main machines, and I keep a lot of them as backups for whatever I'm using daily because I tend to find it easier to just roll a different machine while I fix the other one, even easier now since I have Linux on the majority (only two machines have Windows 10 at any given time, not planning to upgrade to 11 anytime soon).
They're not immune to the same cycle everything else went down, they're where 486s were when I got into doing this - that period where they are too new for anyone of us to want, but too old for anyone mainstream to want. I'm between keeping and selling on a lot of them because it's easy to accumulate, but then if I hold onto these until they cost as much as the 486s do now, I can "cash out" nicely later. In 10 more years you'll have today's kids and teens trying to get some old Dell OptiPlex 7-whatzit to boot Windows 7 with an unofficial SP upgrade to install, and trying to get it on their Wifi network so they can drag that 280MB Abandonware install of Five Nights at Freddy's, Fortnite, or Minecraft to the hard drive. Probably will pull more than 486s tend to today because of inflation and the fact these are getting trashed way faster than the old stuff was - that usually laid in someone's closet/attic/garage for a decade or two.