If Bono still hasn't found what he's looking for, it's not because he can't afford to buy it. The U2 front man is one of the richest rock and roll stars in the world, but despite the global success of his legendary band, not all of that income has come from the music business.
Bono, real name Paul Hewson, is a shrewd businessman as well as a great performer. He's taken the money his fame has bought him and invested it very wisely; he owns shares in Forbes magazine and a range of luxury hotels at home in Ireland, but the best decision he ever made was probably to invest in Facebook at an early stage in its development. The private equity firm he runs made a $210m investment in the pioneering website, and that investment is worth something like $1.5bn today. His fortune has enabled him to do great things for African charities.