[nickersonm]

Why would you want to bring it back? There are literal gigatons of useful material 'up there', perfectly usable in-place (or anywhere that's not down a well) with low effort. Even with Starship, it's easier to use resources at the destination rather than boost them up.

[tsimionescu]

Because we only care about resources to the extent that they are useful to us, and by definition we are down here and not up there.

Now, it's important to note that there are some wonderful research insights that could be gleaned by landing things on Mars, and also perhaps by using martian resources to launch things further away from Earth. None of these require 1000 rockets landing on Mars though.

[Moissanite]

Demand for manufactured goods on Mars is at an all-time high, but I fear still not enough to make the economics work.