How accurate and important is the "eggs in one basket" argument?
If we believe it, then we (humankind) will subsidize the colonization of Mars, without any expection of recompense. If not, then likely Mars will never be colonized.
Unless we discover a "killer app". Maybe "blueberries" will be found to be a compact energy source... Just kidding. But on the other hand, Mars has some funky minerology. Maybe gemology, too? Anything coming from Mars that did not have a counterpart on earth would have a high value here. What would someone pay for a "blueberry" ring, if there were only 100 like them on the planet?