A billionaire oil tycoon, who just last month agreed to pay $1 billion after a highly contentious divorce, now says it's no longer fair to ask him to pay out the big bucks because his wallet has been hit so hard by falling oil prices. Hamm's oil business Continental Resources was worth big bucks during the 26-year marriage because of rising oil prices but now, with oil at about $60 a barrel , the company's value has taken a hit, along with his wealth, he says.