I would cash a few billions too, if I had the chance. It would allow me to do things like Bill &#38; Melinda Gates do with their charity funds.  Maybe Sergey Brin plans to eradicate malaria from the world and save millions of children each year?  Maybe Page wants to use his billions to preserve precious rainforests by buying the land these forests are standing on?  After they made this great company, maybe their ambition is to make great impact on the world, too.