The Beech 1900 is used to fly Engineers, tools and spares to where ever they may be required. Trying to get a battery or set of wheels and the jacks,tools etc to a major airfield is difficult. Trying to do the same to a remote airfield can take days. The DOC can get you from the Hangar with everything you need and park up next to the u/s jet quicker than checking in with the airline. You don't have to arse around at outsize baggage trying to get your kit and it won't have been dropped off any conveyor belts. The u/s jet is often sorted before the DOC has refuelled.
Obviously it is not always required for engineers and it has been used to position crews. It has also been used to collect stock for very special customers!
As for the Beech drivers being screwed, 3 crews, 1 aircraft sounds good to me! Ending up at Luton most nights, yeah you're right!
http://www.airliners.net/search/phot...s=netjets+1900