How do you make sensors so good? Are you sensing air pressure disturbance, high frequency sound, electromagnetic radiation, … ?
I only ask because I wonder if something like a basic mounted, no internal-targeting, missile would be detected. E.g., if all routing is determined before fire, pre-loaded, and the final payload flies without emitting a signature.
At a cost difference of 1:700, I think you can afford to miss a few shots.