It comes down to an appeal for efficiency. If power is the rate of doing work, then a 4 MHz Z80 running well-written software is just as powerful as a 100 Mhz Pentium running a Windows application. That generally also implies that you use something until it's physically unservicable. Only when it's completely worn out and unrepairable do you replace it. I hope more people make an effort to find good homes for the machines and peripherals that no longer meet their needs.
Chances are, it'll be just the thing someone else needs.
Just because something's old, doesn't mean it's worthless. In 1983, after much prodding and nagging, my parents finally bought for my brothers and me a Franklin ACE 1000. My dad still uses it today. In 1984 or so, we acquired a second Franklin ACE 1000 which included a PCPI AppliCard . This, I used for many years and subsequently found and purchased additional AppliCards to run in my growing collection of Apple computers.