$10,000 can be cheap for a one way drone. Bombs often cost for more than that. The real question is value, if hitting the target is worth more than the cost of what you hit it with then you have a good value. Taking out a $1000 drone with a $100,000 missile is a good value if that drone is headed for a $1,000,000 building, but if the drone is headed for a cow probably not worth it.