Not many people make consistently good returns investing in gold.
One thing physical gold may do is bribe your way out of custody, across a border or through a checkpoint in a third world esque TEOTWAWKI scenario. Full ounce coins are a bit much for that. 1/10 ounce coins cost more by weight but would be more realistic for that sort of transaction.
Refugees have been known to roll gold into wire and sew it into the hem of their clothing.
During a crisis when there is nothing to buy, gold can't make food appear from the ether, but it is very useful for rebuilding afterword if you managed to survive.