"Fortune does not change men; it only unmasks them."
-Marie-Jeanne Roccoboni, 18th Century French Writer
You see this all the time in the movies. One person stumbles upon fortune and they begin to act differently. They can act pompous and like a jerk towards their true friends OR they remain the same and treat their friends and family to things. It is when they lose it and they are left with nothing, that they revert back and apologize. In the second case, there was nothing to unmask, because there was nothing to 'change'.
You always see people 'change' due to something. But really, it is them being unmasked because that part of their personality has always been buried in there somewhere, the fortune or event or whatever it is was the excuse that let them reveal that part of their personality.