Considering the fact that I paid less than $100 for the VAXstation 4000/60, for instance, and they go for > $1000 on eBay these days, I'm glad I kept all my VAX hardware. While 286 systems don't cost quite as much, the prices are only going to go up.
I kept a handful of older computers, my ZX-81 still sitting somewhere, ZX-Spectrum, Apple Newton. My HP-48GX is used by my daughter. I have a dual CPU 486 machine... I doubt any of these is worth any $'s ...
as always with a legacy $anything the price is for those who really want it.
I have Psion 3 (with a damaged screen cablr, but with a whopping 1MB SSD), it costs nothing, but people selling the working ones for more than $100
Big fan of the Sinclairs - small, simple, yet filled with all sorts of neat tricks that made them inexpensive and simple. That cleverness makes for a great set of lessons to modern computer programmers and architects.