Mark Zuckerburg married his long time girlfriend last week, and Billie Joe Armstrong from Green Day played at the wedding. Some clips can be found here. Congrats Zuck.
If I were a musician on his level, the last thing on my list of things I wanted to do is play for a bunch of rich white people for no reason other than they payed money. I'm sure Billie isn't hurting for change to begin with.