There's a fabulous article[0] by William Langewiesche in "The Atlantic" that I read years ago to that effect; it's "An Extraordinarily Expensive Way to Fight ISIS" that follows a B-2 mission against a group of ISIS militants in the desert that shows how ridiculous they are against such an enemy. But yes, essentially they are enormous military-industrial capital investments, and it seems they just want to get used now and again.