Whenever I read something that essentially says, "This group of people is different because…" I immediately think, "Well, I know X person who fits that group and he definitely doesn't fit that mold." And of course it's true; any time you make a general statement about a group you're going to have lots of exceptions, but it's important to remember that those exceptions don't necessarily disprove the general statement. That being said check out this article that explores some research that's been done about the affect that money has on people. The research shows that money changes people, and not always for the better:
In fact, a number of new studies suggest that, in certain key ways, people with that much money are not like the rest of us at all. As a mounting body of research is showing, wealth can actually change how we think and behave—and not for the better. Rich people have a harder time connecting with others, showing less empathy to the extent of dehumanizing those who are different from them. They are less charitable and generous. They are less likely to help someone in trouble. And they are more likely to defend an unfair status quo. If you think you’d behave differently in their place, meanwhile, you’re probably wrong: These aren’t just inherited traits, but developed ones. Money, in other words, changes who you are.