Exactly my point. They add certain value to the economy and have fundamentals. From my understanding, I don't even consider Gold (a limited resource) a long-term investment.
Gold (and commodities more generally) have fundamentals - just different ones from equities. You can't take advantage of the universe of sound investment opportunities if you restrict your attention to equities.
So I guess the point I'm making is that often a lot of gold makes sense too.