Mr Benioff had his lucrative epiphany while on sabbatical—swimming with dolphins, he says.

Liu has a nice pile of cash and a delivery network in 300 cities to help him maintain his edge, but he'll need to keep generating new moneymaking ideas.

Now they are making money on that generation’s fears, and it is not just computerized flash card makers with the money-making ideas. Doctors and geneticists have also tapped into the market.