Gold coins are cool, but in an oh shit situation, I want small bits of gold that I can use not one big coin.
And what exactly are you planning to use them for? If the economy totally collapses, and some idiot shows up at my door waving a vial of gold flakes in front of me, I'm punching him in the nose and sicking my dogs on him.
If you guys are really that worried about a total societal collapse, then stock up on things that are at least useful and worth trading for. Fuel, ammo, lard, seeds, lumber, corrugated metal, copper wire, batteries, generators, engine parts, fertilizer, rubbing alcohol, medical supplies, etc. What's anyone supposed to do with a little vial of gold flakes?
As Andrey pointed out, gold is only useful if you have enough other resources to sustain yourself during the rough times. It's going to be no good to you during the rough times. It'll only be useful when society gets back on its feet, stable currency starts flowing again, and you can trade your gold in for it.