America's ROI, for that matter the Worlds ROI when it comes to NASA is enormous!! Moreover - how do you put ROI price on man going to the moon? Well we do... and I bet were you to go back in time - American's would have been glad to pay ten times as much! That's called consumer surplus! Woot!!
But seriously, trickle-down does exist on R&D done by NASA. Every morning I wake up feeling better than ever because of the foams they developed :)! Seriously! :).
Ok - that's just wrong! By that standard I guess you don't care what's going on in Israel, or what happened in Spain or... wrong. Just saying.