By the time he gives it away it is likely worth more than 45B. So unless he is willing to give it away on the spot the same day it is not worth anything and is just a PR stunt? Sure I don't particularly like the letter and the way he announced it or even the guy for that matter but he just committed 99% of his net worth to charity and deserve some credit for that. Not people bitching and moaning about how he did it in the 'wrong way'. Can you really commit 45B dollars to charity in a wrong way? How big portion of your money have you given to charity?