I really don't know what to say. Hard to feel sorry for someone who has everything. He has been looking aged lately and with age your ability to manage alcohol diminishes. It is careless but I really have no room to talk because I have had times when I was younger that were suspect. He is human and we make poor choices sometimes. He will suffer the consequences just like everyone else.
I answered the question with a 9.
I'm a 14 handicap (although not officialy) I can tell you that with expert green reading advice, I would save 5 putting strokes, club selection 2 and a little vote of confidence and relax chatting another 2. I would imagine an 18 would be close to that.
I think this recent blog post shows someone who really really wants to return to the pro circuit.
Clearly it's not about money. I guess it's hard to be at the top and accept an early retirement.