A bad person will never make you a good deal. People with intergrity are predisposed to perform; people with intergrity are predisposed not to perform. It is best not to get the two confused.
"Never be afraid to ask for too much when selling or offer too little when buying"
People fear embarassment if they ask too high a price when selling or offer too low a price when buying. No one wants to be seen as greedy or cheap. Once negotiations begin, you can come down in your selling price or up in your buying price. But it is impossible to do the opposite.
If you ask or request, you might get it, but if you don't ask, then you will not get it at all.