No he sits there and is thinking. Thinking about everything in life, books he read, stories he heard, life itself. That's what I see. Not nervous at all. Someone who is in balance.
You're right; what's to be worried about when you're as wealthy as he is!
LOL! I'm not a millionaire, but I see no any difference in me when I get much money or when I almost in zero (like now). It varies all the time.
One thing I can compare to it is when you just bought a very pricy guitar and the moment you played it you realised what you play as before.
I love this picture because it's not a standard 'Hey MARK! Say chees and look on the camera' stuff. But my favourite is Shangri-La photoshoot:
It was first time ever when I saw Mark, in the booklet for a concert, the moment I will never forget. This gorgeous photo just blew my mind.