Very likely Musk hasn't given a thought to this prospect. Like refuel Starship in earth orbit. Then refuel again in Mars orbit. Go grab an asteroid and refin

Very likely Musk hasn't given a thought to this prospect. Like refuel Starship in earth orbit. Then refuel again in Mars orbit. Go grab an asteroid and refine it back on Mars. Send 20 tons of gold back to earth on Starship. The Mars economy could be sustained this way. Pie in the sky really.