An Economic and Social Contrast

For the last week, my family and I spent the holidays and New Year at the Atlantis Resort on Paradise Island in the Bahamas. As I was walking to dinner one night, located by the marina, I was amazed by the huge yachts that lined the dock. One in particular caught my attention. Located on the lower back of the yacht was a small submarine. On top of the yacht was a dance floor. The ceiling that covered the dance floor changed colors with the beat of the music. Furthermore, the side of the boat carried jet skis. To top it all off, on the back top deck was a helicopter. I was amazed at the size of the boat and the number of expensive accessories it carried. The cost of this boat must have been close to a hundred million dollars. (Yacht= 45 million, submarine= 10 million, plus all other accessories, including the helicopter) With our failing economy how can someone afford to live like this? The lifestyle sharply contrasts to that of many people struggling in the United States, and throughout the world, to pay their mortgages and put food on table as they have lost their jobs. They are concerned how to put their kids through college and struggle to support their families.
How can this dichotomy exist? Do these wealthy people give anything back to society?