Owning a sports team was once a guaranteed way either to lose money or to make a little by spending a lot. Today, the world’s wealthiest people are snapping up elite franchises, backed by an army of wealth managers, data experts and investment bankers. Ivo Voynov, global head of sports finance at Citi Private Bank, explains what turbocharged sports finance, and why it is such an important and profitable business for global private banks.