> Also the chair, if actually built, would be so expensive that one legged guy can’t afford it. His best hope is someone with a worse chair takes it, then he tries to take their seat, but there’s already a dozen two-legged guys in front of him.

Maybe you need 5 chairs? Here in SF supply has fallen decades behind the demand curve to the point it may be impossible to catch up even if all you did was build build build.