I don't know. It was a proof of concept and helped work the bugs out for succeeding generations of low-visibility aircraft, and it proved invaluable in the first Gulf War. Hard to put a price tag on all the aircraft and air crew we didn't lose because the Nighthawks flew so many sorties without the loss of a single plane, softened up (or totally elimnated) the air defenses for more conventional planes coming behind them and pretty much wiped out the opposing airforce. (Scaring what it didn't destroy into internment and inaction in a neighboring country.) Not bad, all things considered, and the B-2, F-22 Raptor and other planes owe a lot to the Nighthawk.
I recognize that it was a proof of concept. I also know a B-2 is half the cost of a nuclear powered attack submarine, which has a much longer loiter time, much greater weapon capacity, a broader sensor suite, and lasts a lot longer. And it actually can't be found
And trust me...the Pentagon can absolutely put a price tag on aircrews They do it all the time.
I was expecting more years out of the 117. That's not a long lifespan for that kind of dough. That's my point.