I would favor a Mars prize ... say 5 billion to land dozen people. Payable upon safe landing. Up to dozen and so 416.6 million per surviving crew. And another 416.6 million per crew surviving after 5 years on the surface. Prize expires 2033. Total amount possible 10 billion dollars.Ok, this is how I see it happening once this prize was announced.
Mars One contacts all their potential vendors into a room and says, "Let's go for it." They haggle the details revising the current plan. A little known blogger suggests they do it with two upgraded sundancers and hands each of the potential astronauts a copy of his settlement charter emphasizing the point that if a transportation company doesn't sign on to it only they would own martian real estate.