You know, from what we see in movies, I can definitively say, assassin - or in this case, our happy mission executing freelancer/merc/bhg, will make much more money (if he is succesful) than a little employee running his cargo ship from point A to B, or a miner doing his very dull mining duty.
So... why are missions so worthless... they send us alone against entire station and wings of enemy ships only to get a fraction of what is needed to maintain my ship? beuh.