Actually I think Pharrell is a pretty cool guy and I wouldn't be surprised if he actually rides his bike more than the average, non-celebrity American does. Does he need a bike that NICE? Probably not, but let's face it, when you have as much money as he does, you will probably have a nice bike, even if it is secondary to a career in music. Personally, I don't begrudge him of having a better bike than I have, lol.

EDIT: P.S. Is it even his bike? I mean this pic wasn't posted with much context.