Government has never, ever been in the business of lowering the cost of anything (except corn and wheat). It's in the business of creating infrastructure, protecting its people, looking out for the "general welfare" (which should include health, but I digress...), and demonstrating the efficacy of things ("hey, now, would ya lookie there. We got a man on the moon. Huh, go figure" or "hey, you hear that University scientist and the NIH just cured Polio? No, really, they did!").
Now, the technology transfer of government output to the private market, that's where the lowered cost and great value will come to the fore. I'm sure I'll rile the free market feathers by saying this, but SpaceX and Virgin Galactic would not exist without NASA. No way, no how.
Just to get you geeked out about NASA, though, here's a fan-made video on Youtube: http://www.youtube.com/watch?v=NXkuo1yihjs
Jersey Shore-style Fist-pumping science.