OK, so maybe Bono knows a thing or two about the plight of some African nations economically and that the way the World Bank has been operating doesn't work but appointing a rock star as head of a world economic organization? Shoot, why don't we put Mick Jagger in there instead? At least he has a college degree in economics.
Really, this would be like appointing Jay Leno in charge of Harley Davidson just because he knows a thing or two about motorbikes.