Damned I think you just need to hang on to stuff until the right time.
I think I've had cheyenne and crossbow before and put them on Ebay for $20 untested.
Thought they'd sell with a hotness, I always see people looking for these games.
I've seen stripped jacked up boards selling for a couple hun each.
Nobody bought them so I made adapters and a rigg to test them out, took several weeks and they only ended up only selling for $35 or so each.
This was about seven years ago.
Same thing or worse with old b&w or vector games.