Don't use it just to use it. If some tech doesn't fit into your current needs, don't try to make it fit.
I have a dual xeon server I just retired, only because I didn't want it taking up precious space in my renderfarm that could be occupied by a single CPU computer that uses less power and runs faster.
As for selling hard drives, anyone that would buy a used one is a sucker. Mechanical hard drives would be at the top of the list of things you want NEW. You'd probably find somebody dumb enough to buy it -- even though you can get a brand new one for pretty cheap.
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