Precious metals are also risky long-term in that we don't know how "precious" they truly are in a solar system-wide context. We can make well-informed guesses,

Precious metals are also risky long-term in that we don't know how "precious" they truly are in a solar system-wide context. We can make well-informed guesses, but until there are boots on the ground of the Moon, Mars, and the asteroid belt, we can't know for sure.