Unfortunately there is a 30% tax for trading and 30% death penalty of all your money, well this is where greed comes into play: (% can vary!)
GRD 20%: Reduces trading tax to 15%
GRD 40%: Reduces death penalty to 20%
GRD 50%: Reduces overall penaltys by 5%
It would bring a new sense to greed as it is currently useless.
Note: for trading this would only apply to those who are PAYING, not receiving.