$1,000,000,000 per life saved

Kip Viscusi's estimate as reported to Bryan Caplan:

Viscusi told me that, in his judgment, the median number of deaths from domestic terrorism [terrorism occuring in the US] in the coming year will be zero, and the mean number of deaths in the coming year will be 50 - "or about half the number of motor-vehicle related deaths per day." If Viscusi is right, it's safe to say that we're [the US] annually spending more than a billion dollars per life saved.