It’s always a pleasure read Florian’s interesting threads.
Well, without knowing the details of the story, there’s no way of knowing what happened to your friends who struck it rich. In my opinion, money cannot change people. Your friends were probably “heartless” while they were poor. Money just gave them the opportunity to express themselves better. Any hypocrite can talk about the goodness of helping others (and many do) when he doesn’t even have the means to help himself. Money doesn't change people; it just empowers them to reveal their true nature. Money cannot make a fool wise, as Som pointed out, but there are plenty more fools without money, who will never have the opportunity to reveal their foolishness.