Bono, with Geldof as a close second. Years ago, I worked for a publication firm that was owned by the Boomtown Twat, but telling people that he was the proprietor was a sackable offence. Presumably because he didn't want people to know he was a capitalist at heart.
Pleased to see that Roddy Frame and Paddy mcaloon are not on the list! You have however left out two of the biggest arseholes in the business - I would have voted for Phil Collins in second place with Paul McCartney first. Honorable mentions for Mark Knopfler, Roger Waters, Dave Gilmour, Brian May, Robert Plant and Jimmy page. Cock sockets of the highest order.