I hope this still works as I've started a hardcore playthrough  and I was looking for a way to make money playing as a good character. Every single guide out there, the method is robbing the towns blind and I didn't want to do that.,(reply>), Robbing Cumans  is much better than robbing towns; because their armor and weapons are not considered stolen and have high values.  Using potions, you take take on several cumans at once with little fear of being chopped down.