Some bands are very good at the business side of things...for example Metallica (when it comes to exploiting their tours)
I think U2 are one of them as well.
From what I've seen, PMcG seems to have a good handle on things, for example they renegotiated their original contract with Island, to include shares in the record company. For Island it was a smart way to hang on to their biggest act for a while.
Around the time of R&H, Island was purchased for ~500Mil$ by Polygram (then a division of Philips Electronics) meaning they (U2) got a huge sum for their shares. Philips was interested in Island exactly because of U2. The only other major artist on Island being Bob Marley.