Drones aren't as cheap as you might think when you actually tally the total system cost, including ground systems; and the UAVs still have significant issues op

Drones aren't as cheap as you might think when you actually tally the total system cost, including ground systems; and the UAVs still have significant issues operating in various mixed airspaces. Take a look at the costing for General Atomics Predator and Northrop Grumman Global Hawk systems, as well as the issues the Germans have had with the latter.