This game needs a way to reset your account if you have lost all of your money due to tournaments and you have crappy guns for your level (i.e., Revolver with a level 5.)
If you know where all the critical spots for all the enemies are, play as the Rouge class and use accurate weapons like Revolvers and Rifles to score said critical hits. This way, you can keep a high accuracy percentage and get massive amounts of money at the same time. Have teammates that use rapid and area weapons to help bring down the monsters' health. 5/5.