You don't have to be a scam artist to write an ineffectual book about self-improvement.
Agreed but, again, to the extent that he introduces people to Bitcoin, he's not being ineffectual, quite the opposite, and I'm grateful to him, in spite of the fact that I have no interest in buying his book.
I don't like Justin Bieber (or for that matter Tony Robbins or Kiyosaki), but I'll be equally glad the day they come out endorsing Bitcoin. A true statement is a true statement, regardless of who says it, I don't care who the messenger is as long as the truth gets out there, we're gonna need all the help we can get when the powers that be start their Bitcoin demonization campaign in earnest.