Why Give?

Why does a billionaire give? Billionaires give five to ten percent of their money to people of different causes. Why do billionaires do that? Is it because of their selfishness or kindness? Our obligation to give to people is our own right. If people decide to give, we will be in a better position. In my opinion, people we always be selfish, no matter what they are doing in life. According to Bill Gates, I am wrong; people will give for no apparent reason. So, if he is right then why are we still sitting down doing nothing. I'll tell you why, because of our selfish ways.