Stack away, I'm not trying talk anyone out of gold or silver, just proving it's a terrible place to put your money. The world hasn't tuned to crap ever since I've been here, and even if it did gold and silver would probably be worthless, the last thing you'd need is chunk of metal. You can't eat it, live in it or drive it.
This certainly isn't a recommendation, I know goldbugs for some strange reason hate banks, but they're one of the best money spinners out there.
And this chart excludes reinvested dividends which would send CBA 'to the moon'. I'm afraid 'stackin' has absolutely no appeal to me whatsoever.