I regard Andrew with a high regard for the quality of his blog and the insights and analysis he shares with us all through it, so when I had the chance to participate in his Q&A system, I submitted the simple question: "What fuels you?"
His response is both genuine and humorous. Here's the YouTube link to his response:
http://www.youtube.com/watch?v=Oo9buo9Mtos
I'd like to think we all share similar motivations.