I haven't read all the stuff here, but just about that: I would argue, that in the case of gold, bitcoin & co, it boils down to reduction of entropy. for gold, you have to find and combine all the tiny bits (atoms) to bigger chunks. That reduces the scattering, i.e. entropy. this needs energy! bitcoin: the low hash value is one of the purest forms of entropy reduction you can get. also needs energy.

so, only the cost of making something doesn't count, but it counts if its goal is to make something "special" or "unique".