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I'm a big believer in scientific exploration. The men on the moon were
great political gamesmanship. But the Mars Rovers have shown us the
huge advantage of NOT having people on board: much better missions
and much lower costs. I've discussed this with many people in the
business, and it is very hard to find anyone who thinks there is ANY
genuine scientific payoff for adding people to the payload, despite the
huge increase in cost. Cool as all get-out, for sure, but I don't think the
taxpayers are willing to foot the bill to make a few more people into
super-cool heroes.