I'd like to come up with a suggestion. That everytime you kill someone you get a bit of money, maybe about 250-500 dollars depends on their rank?
Civilian = 50 Dollars.
Assasin = 250 Dollars.
Paragon = 250 Dollars.
Devil = 500 Dollars and so on and on and on. I hope you get my point and will add this to the game, it would be cool.