Before the decathlon I'm constantly trying to convince myself that I want to do this, that I want to take myself to that place where it's going to hurt and things are going to be tough. But that's like anything - you want to give your best.
A big book is like a serious relationship; it requires a commitment. Not only that, but there's no guarantee that you will enjoy it, or that it will have a happy ending. Kind of like going out with a girl, having to spend time every day with her - with absolutely no guarantee of nailing her in the end. No thanks.