There is a booming business in recycled gear.
An old boss retired and started getting calls from other geezers who were getting calls from old clients (he was a CE for DEC and SGI way back).
He ended up starting a little business with maintenance contracts or subcontracts with other providers. A couple of years ago he was making a good buck and had 7-8 guys in the field.
Usually customers were really big or really small and had some ancient system that was too expensive to figure out. One utility depended on a cluster of 33Mhz PowerPC AS/400 boxes to do their billing — they paid a lot of money for best effort break fix. Another used 286 PCs for controlling elevators.
I have a Zenith/Heathkit Z-160 luggable, an 8-bit ISA bus system, which I installed an 8-bit ISA network card in. 8-bit ISA network cards are much more difficult to find than 16-bit ISA network cards but still it was only $20 on ebay.