Lets see .. their is maintinence, ammo costs, repairs, profit , not to mention my current (earth) alt mode will cause most autobots to pause before firing, if they get the chance.
Lets just say you better be as rich as you are evil. I keep a running inventory of each mission so if the mission goes well it will cost less, If some of your cronies muck it up it will cost a lot more. Consultation fees for all this will now cost you 2,000 enrgn.