Lately I've been noticing some of these older boxes I have are getting older t han 15 years old, and the purpose for them can be accomplished with a Raspberrry Pi or other sbc. I would be using a fraction of the electricity and have have space and heat buildup, so it's not a tough decision, or at least appears to be. I keep some older more retro pcs around for nostalgic reasons, and I use some of them for technology transger to the really old retro pc's I have.
Any other reason than sentimental, personal nostalgia is nuts, regardless how much space you have. I've repurchased my original amiga to keep it in the storage and run my amiga from FPGA based system with original joysticks for games, with much more power in smaller box that runs on 5A android phone adapter, consuming little power.
ANd that's the key point also mentioned by you. Tech moved so forward that having 2x-5x of the same performance in the same style of old micro-computing can be achieved with today's tech either by emulation or another wave of homebrew computers that you can discover.
/h1
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