Its not just about being able to sell it, but selling it for enough to justify the shelf space it takes up and how long it will be sat around waiting for it to sell.

I totally share the desire for really cheap very old hardware. But is there any financial justification for a charity shop paying to stock it? Plus the energy cost to run it if you do buy it.

Then compare to the price tag of a pi zero.

I wonder if you could play some of the Soldak games on it? I got Drox Operative 2 running on a low spec laptop from 2011 at 60FPS.

Probably the newest games with the lowest spec requirements I can think of. Otherwise there is retro gaming.

Don’t need to use the keyboard if you just access it over SSH

Just don’t buy more than you can reasonably eat and it really isn’t going to matter