Jamesdevice,
Unmanned aircraft save 1 person airborne - the pilot - but according to Wiki at the time of writing, 39 Sqn had around 90 people to operate 2 (increasing to 6) Reaper.
Of those there are twelve 3-man crews. 36 'crew' As compared to what would be between 4 and 12 pilots if they were manned aircraft.
And how many more are added to the engineering teams to deal with the real time data link/uplinks blah blah blah...
The 8 aircraft Harrier det at KAF operated with around 100 total personnel.
I do grant you, Flying Pay bills will probably be less with UAV.