Yeah. If anything, a gold coin is too much value in one piece. Like, who are you going to find with enough spare stuff to trade that would actually be worth the equivalent value of an ounce of gold?
I figure that someone with nothing but gold coin would end up with very very expensive food, and with some luck a very expensive gun of some kind.
I would expect that if I had a pile of gold, the first armed person to realize that I have that much gold would immediately shoot me to get the gold. Then the next half-crazed, highly stressed, armed individuals would take them out and the cycle continues.