You can't eat it.
You can't use it as a tool.
You can't even buy groceries with it (well at least today. Point is: it's not a liquidity).
But yes, maybe you'll be able to make a profit in the future, by selling it to people who can't eat it or use it as a tool either. Or I guess trade it to save your life in a hypothetical future scenario.
It's just a weird way of keeping value. Wouldn't you rather buy a piece of land? At least you can pitch your tent or grow potatoes there.
Am I missing something?