Bottom line is I didn't return to Apple to make a fortune. I've been very lucky in my life and already have one. When I was 25 my net worth was $100 million or so. I decided then that I wasn't going to let it ruin my life. There's no way you could ever spend it all and I don't view wealth as something that validates my intelligence.
In this time of budget cuts we cannot forget that basic science is a building block for scientific innovation and economic growth in the information age.