There needs to be a class feature called "Screw the Rules, I've got Money". I have no idea what it would do, but it would fit the theme perfectly.
Alright, now for a serious one.
Diminish Costs (X/2)% and Greater Returns X%
X starts at 10 (DC at level 3, and GR at level four), and goes up 10 every 2 levels.
DC lessens the costs of buying stuff by whatever percent the feature comes out with, ending up at 50% costs
GR raises the selling price of anything you are trying to sell (and/or gain through landlord, for example) by that percent, up to a 100% increase.
Nifty, huh?