If at first you don't succeed, troll, troll again. Profit isn't profit unless you take it from someone else. It's better to swallow your pride than to lose your profit. Oo-mox can be it's own reward. Never, EVER charge a fair price.
Water is thicker than blood.
For every Rule, there is an equal and opposite Rule. Never close a deal soon after a female strokes your lobes. If they take your first offer, you either asked to little or offered too much. A warranty is valid only if they can find you. Money can't buy happyness but it can buy Porko the breakfast monkey.