Normally intentionally "leaks" are just "anonymous sources" etc. They're very rarely if ever named.
Plus she doesn't need the money, she is one of the richest women in the world. I suspect she wrote under a different name to see if the book would stand on its own without her big name boosting sales.
Never underestimate what the rich and super rich will do to get more money.
Does Warran Buffet need more money? Yet he's still trying to make himself richer.
Do all the top CEO's, VCs, and board members in the world "need" more millions and billions? Maybe not. But it hasn't stopped them from trying to further enrich themselves.
Besides, there could be other motivations for this stunt, such as fame or wanting to be talked about or thought of as a certain type of author.
"I don't have a problem with guilt about money. The way I see it is that my money represents an enormous number of claim checks on society. It is like I have these little pieces of paper that I can turn into consumption. If I wanted to, I could hire 10,000 people to do nothing but paint my picture every day for the rest of my life. And the GNP would go up. But the utility of the product would be zilch, and I would be keeping those 10,000 people from doing AIDS research, or teaching, or nursing. I don't do that though. I don't use very many of those claim checks. There's nothing material I want very much. And I'm going to give virtually all of those claim checks to charity when my wife and I die."
Good one!
Doesn't have to be about money. Success and acclaim as equally addictive.