The advantage isn't taking metals back. It's using them on Mars. If there really is even just metallic iron, that'd be a HUGE benefit for colonization.
However, without trade, the colony will always be dependent on its parent nation. And that's not really a colony, it's just an outpost. A really expensive outpost.
The advantage with asteroids (and to some extent lunar development), is that you can serve other markets. Even if it's not cost effective to bring the product back to Earth, as long as it's cheaper than launching from Earth, there should be a small but growing market for in-orbit delivery. Starting with fuel, then air/water, then bulk shielding an
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