California 1849- gold was everywhere and no transportation that could quickly move gold to the east…
Donald Franck

This is actually a great idea. Not even need to land it on Luna, could keep it in orbit initially while Luna infrastructure is developed.

I think though that the general idea is that PMGs could be used industrially, instead of a store of value. With the huge supplies present in asteroids, price could be brought down enough to allow widespread use in the industry. Starting off as a bank, now that’s a great possibility for initial use.