One of the appeals of drones may be that some of them may give access to technology and flexibility to smaller sub units of the military. Unlike large jets or satellites, drones may be available to autonomous subgroups in the military. Decentralisation of info gathering and attack capability may be advantage to the military or a disadvantage.But it is definitely an advantage to sub-units.
Same with domestic surveillance. One can imagine that drones might be used by more than one agency that might have different levels of autonomy from central authority, and different agendas.