One of the Starbucks locations at which I worked was in a pretty wealthy area, yet our tips were just a little over half the area average. One of the younger baristas wondered about that, asking, "wouldn't our tips be higher than most of the other stores since people around here are so rich?"
I simply replied, "Do you really think these people got rich by giving their money away?"
You know, Jesus had something to say about this very thing. Funny how people haven't changed, and how we haven't yet learned lessons from thousands of years ago. A fair chunk of Jesus's parables and other teaching can be summed up as, "rich people are assholes." Fail to understand this and you'll get burned every time.
