A popular indie game is not so surprising. What's surprising is the sheer magnitude of the profits: $359,000 in daily profits -- a $131 million profit run rate. Pure profit. It's conceivable that Notch will become a cash billionaire over the next few years if the growth continues. That's just insane.
Especially when you consider that Notch split his $3M cash dividend across his staff - I don't know if it was staggered across the roles, but on average it would be roughly $125k a piece.