You save gold coins, I save food. If (when) the government collapses, how can you be sure your gold & silver will be valued so much?
The value of metals are tethered to the dollar. When the dollar disappears and with it the market exchanges, the value of these metals will vary wildly and subject to valuations within individual transactions on a small scale, not a large scale as it is now.
For example, you come to me wanting to buy one of my bags of rice. I say it'll cost you 5 silver coins (because I'm a greedy bastard) and you say that's ridiculous. I shrug and you go looking elsewhere, but other people with bags of rice want even more (I'm really a kind-hearted soul). You're now down 5 silver coins, more than you thought, because you weren't rich before the fall and could only buy so much.
Supply and demand is largely determined by the big markets (including and especially when it's manipulated). After the fall, that value is splintered and it becomes real commodity vs. real commodity. As the holder of a real commodity, I decide individually what your silver is worth to me. Since I can't really do anything with silver after a collapse (maybe I'll take a coin or two to make CS) I won't be much interested.
I will be interested in eating (as will you) no matter what happens, so it seems like a good idea to go for food first. Once you're stocked-up as well as you can be, go for the metals if you want. Maybe someone will want them.
I find it interesting so many conspiratorialists theorize the eminent collapse of the current gov't and vent against then inevitable rise of the NWO. If the NWO happens, they're gonna take your coins and give you a chip with electronic money.
What we're really hoping for is a new, benevolent gov't to arise from the ashes. Then you will see a return on your metal investment - if you can hold on that long. It will be a long night before the dawn, so you'd better have something to eat and keep yourself alive before then.