Odd to see a stress on interest in a problem for its own sake from pg, who has elsewhere written that the startup economy would be crippled by raising taxes on people who had already gotten fabulously rich. If being in it for the money is "the wrong motive" to do a startup, downgrading the potential financial gains from set-for-dynasty to merely set-for-life would seem to be a way of ditching the poseurs...
"People's motives are as mixed in Silicon Valley as anywhere else. Even the founders motivated mostly by money tend to be at least somewhat interested in the problem they're solving, and even the founders most interested in the problem they're solving also like the idea of getting rich."
Yeah, but the parent talks about 'raising taxes on people who had already gotten fabulously rich', not some kind of radical egalitarianism. You'd have to be very strongly money-motivated to be deterred by the prospect of merely having hundreds of millions rather than a billion, or a couple billion rather than several billion, or whatever.