Perhaps I should but I don't buy computer tech very often, so when I do buy computer gear I'm looking for something that will last.
I do buy a lot of other stuff used clothes and consumer durables from charity shops. Why woud I pay loads for a good shirt when I can get one for a fiver, a few hundred for Barker shoes when they are £20 or a grand for a Canali sports jacket when I can get it for £20 at the Oxer. Hell, yeah I love a bargain but when there's little that will go wrong or it's be repairable which is increasingly difficult at component level with ICT gear, mostly if parts are needed.
I bought a turntable and a moving coil amp S/H about 20 years ago and they are still going strong.
I made the mistake of buying a whole PC from Cash Convertors once. It only lasted about a year and I was screwed by the OS being pre-installed.
I'll be looking for a laptop in the future and with so mana having RAM and eMMCs soldered in, I might need to go to the S/H market to get one that is upgradeable (though I could rework a board if I was certain I could find compatible eMMCs).
Some of my test equipment is second hand. I got great deals on that an Agilent bench PSU for £35, just needed a jumper moved and optionally the PROM upgraded.
I got a Mobo, CPU and RAM from a kind fellow off on Freegle when my last one died after 12 years use and I had no cash.