Multiplying the saved cost by probability of a defeat (which is ineffective mentioned by writer) does not seem bad considering the grid is low-cost design. But

Multiplying the saved cost by probability of a defeat (which is ineffective mentioned by writer) does not seem bad considering the grid is low-cost design. But placing timer/accelerator in RPG as a backup plan for fusing in case the warhead is shortcircuited also seems low-cost. I must be missing something here.