if your gold is confiscated, it's only because this metal (infinite quantity in the universe, the galaxy, even in the solar system, including the moon and asteroids belt) would be necessary in a weapon system in massive scale... and as most of the time it's just a thin foil for space related with human activities... you are pretty safe, for now :).
and why would the nsa take your gold? make more chips? I mean...
You are, of course, correct that gold is not very rare.
And you have, of course, heard the adages:
Money is power
Gold is the only real money
So, as long as people still use money and there are people who have an unquenchable thirst for power, then these people will be looking to amass more gold. Even if they have more gold than "all the gold in the world".