I disagree. A lot of spin off technology came to the us from NASA. Here is a partial list.
http://en.wikipedia.org/wiki/NASA_spin-off_technologies
I dont think there were dozens of trips to Mars. And the ones we sent were pretty economical.
I loved the space program when I was a kid. Back in the days when you could name the astronauts like they were your favorite baseball players.
Little nerds everywhere were inspired.