Interesting. How old is "old"? Is midi gear too modern?
I don't know about "high end" either. I have a Kurzweil Midiboard and an Yamaha KX88 plus some stands, cables, good Yamaha pedals and studio monitor speakers plus some Kurzweil synths, and other stuff like reverb, midi switcher, Roland synth, and mixer in a rack. I had a Moog Opus3 but gave it away. All this has been in my storage room since moving to this house and I haven't even looked at prices in 15 years. It needs to find a new home and be modifying sound waves instead of collecting dust.
Is this kind of stuff still useful to anyone? I don't need to retire on the sale since I'm already retired.
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When I have time to play these days I prefer my Baldwin grand, a little classical guitar, and some brass to keep the lips in shape.
JKJ