Well Elon has always said, that the goal is a roundtrip and that the trip back would be free. I can only imagine what new technology will develop there that wouldn't here. I am sure there will be a whole lot of trade when we find certain resources and new tech is developed.
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Oh, I'm sure there will be -something-. Maybe not tech, but perhaps some kind of planetary shipyard. Mars has much lower gravity than the earth, and so it would be easier to lift stuff, like building materials, to orbit.