As far as investment, if you happened to have bought gold in 1980, you wouldn't have been able to break even again until 2006. Some investment. If you have bought in past year or three, you're out of luck too......
It is a speculation pretty metal. Btw, how are you going to barter that coin and get change back? You going to swap it for a bottle of water? Or a tin of beans? Or even a box of bullets?