Earlier quoted context omitted.
I understand the rational thinking of gold exchanges. You missed the detail about this being confusion on preppers. If the world has gone to shit (nuclear war, zombies, etc), then gold just isn't that useful. If it was silver, you could at least melt it down and kill the vampires with it. You're attempting to use logic in a place where there is none.
Zombies have always been a thinly veiled analogy for fear of the mindless hoard of ‘everyone else’ coming to get you. In my opinion anyway.
Romero confirmed the depiction was that of "the revolution", where "the awake" realizes the vast majority is assimilated, but discovers "humanity" inside himself and decides that it is worth fighting to defend it, as the core hidden topic in the original work which provided the inspiration: Richard Matheson's I am Legend.
All of that installed in the social crisis of confusion, incompetence and violence seen as the core aspects of the '60 in the USA.
...Since we are discussing about cash, and surely you wanted to be on topic, I assume you meant to state "ghouls also renounce to privacy", worsening the scenario Romero originally depicted. Well noted.