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The real problem is the intersection of people who can afford it and people who want to go. Mars will need more people than that intersection to be successful.

• LeifCarrotson 9y ago
  As Musk's plans describe, the problem is that today that intersection is nonexistent. It's perhaps on the order of $10 billion dollars per person, with a minimum flight of 10-20 people all paying that. But it doesn't need to be a loss leader. If that cost was reduced by some 5 orders of magnitude, more people could afford it, and that intersection could grow enough to be viable.