The question is why would we put a man on the moon? I grew up with Moonbase Alpha (although I am not expecting to be thrown into space by a major explosion) and want this as much as anyone else but is there any reason (mining, strategic, know benefits to research) which justifies the price?
That really explains why it happened the first time. Price was not a concern. We were on almost a war footing to get it done. The whole reason that NASA stopped innovating after about 1972 was that the costs were unsustainable.
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[0] - https://en.wikipedia.org/wiki/NERVA#Loss_of_political_suppor...