“No I understand perfectly, but if large quantities are found close enough to make it profitable then a glut would become the reality. “
You don’t understand. The only quantities close enough are under your feet.
I did a project at a very rich gold mine in a remote area of Indonesia. The stuff they were putting in their waste piles was at the same percentage of what we mine in the USA!
But - it was so expensive to get it from the mine down to the port, and then onto ships to the processing plants (in Japan??) it wasn’t worth it. Only the high-grade stuff made it.
Even if one-pound nuggets of gold were scattered across the surface of the moon it probably wouldn’t be cost-effective to bring it back to earth. For sure not if they were on Mars.
I’m guessing a pound of water on Mars would be worth more than a pound of gold too!