This also assumes no risk of losing the plane, of course. If each sortie drops two bombs and has a 1% chance of airframe loss, that increases the cost/bomb for

This also assumes no risk of losing the plane, of course. If each sortie drops two bombs and has a 1% chance of airframe loss, that increases the cost/bomb for the drone by 500k or the stealth bomber by 5 mil. (which is part of why you use cruise missiles for suicide missions, of course)