Side-stepping the opinions of Brand, or any other person for that matter.  The nice thing about bitcoin is it doesn't matter who likes it, supports it, promotes it, etc...  Bitcoin is a function of utility, and it becomes more secure, and valuable with more people using it.  If Brand promotes bitcoin, it would be no different than him promoting Mercedes, except the upside potential affects bitcoin users, not a corporation.  

If Brands million+ fans decide to hop on board with bitcoin, does it matter who the spokesman is?  It's part of gaining mass adoption, and it's necessary if you want things like bitcoin to succeed.  And when I say succeed, I mean, become wildly successful.  Right now most of the conversation is centered around technically inclined people, and outright nerds (I being the latter).  That doesn't cut it among the masses.  Take Linux for example.  Great software, horrible marketing.