OR he was investing his money in the area that he knew best and that would have the best profit he knew how to achieve so he could donate _more_ later. Exponen

OR he was investing his money in the area that he knew best and that would have the best profit he knew how to achieve so he could donate _more_ later. Exponential growth is king. If he had donated all he had in 1997 he wouldn't have even come close to what he's donated today.