3 people who donated so much money they kicked themselves out of the billionaires club

Huntsman told The New York Times in 2013 that by the time he and his wife, Karen, made their first $1 million, they'd already given 25% of it away. To date, he's donated $1.2 billion, more than two times his net worth of $940 million, making his Generosity Index 128%. This year he was awarded the Carnegie Medal of Philanthropy for his dedication to giving.

The Huntsmans were early to join Bill Gates' and Warren Buffett's Giving Pledge, promising to donate 50% of their wealth by the time of their death. Huntsman said his personal suggestion to donate 80% was shunned by some, which leaves him critical of fellow billionaires who will their fortunes. "What they're really saying is, 'If I could live forever, I wouldn't give any of it away,'" Huntsman said. But that's not his perspective.

In 1995, Huntsman established the Huntsman Cancer Institute (HCI) at the University of Utah with a gift of $125 million (to date, he's given well over $300 million). The 78-year-old has survived prostate and mouth cancer and has lost several family members to the disease. HCI is the No. 1 genetics-research facility in the world and a hospital that provides 100,000 specialized cancer treatments.

Huntsman is a dedicated member of The Church of Jesus Christ of Latter-Day Saints. He enlists the community's help to raise funds. In an interview with The Times he said, "You just work day and night if the cause in your heart is justified. You just go out and drive yourself to get the money. And you have fun doing it. It’s a real rush. It’s also very emotional for me."