[mcv]

The one import from Mars that might be profitable does not come from Mars: resources mined from asteroids. Mars is closer to it (and in a shallower gravity well than Earth), so if for whatever reason we want people closer to asteroid mining operations, that might be a viable niche for Mars.

That's very speculative, though. Asteroid mining is probably going to be entirely robots, and both supply of those robots and the demand for the resources are almost entire based on Earth, so it's very questionable a Mars colony will add any value there. But it's the one area where I can see the possibility.

A refueling station on Deimos, however, sounds like a much more interesting prospect.