Let's face it the world won't be habitable forever. Either global warming or nuclear will get all of us. Sure it would be expensive, but think of all the benefits: Extra-terrestrial theme parks (possible), lower cost rocket launches (I imagine), moonwalking.
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Corporate greed sets the priorities of the government. A manned mission to Mars was on the books for early 80s, but scrapped because of the Vietnam War. Mars mission dwarfed by the war spending. Gotta keep those military guys fat and happy.