To have the opportunity to work with Tiger Woods was just so awesome. I enjoyed it. I enjoyed the challenge. I enjoyed the good parts where he was winning. And I enjoyed the challenge to help him get better. But six years was enough.
Programmers and marketing people know how to get into your subconscious - they spend millions of dollars researching colors, shapes, designs, symbols, that affect your preferences, and they can make you feel warm, trusting, like buying. They can manipulate you.
I sometimes feel that if your book sells more than 20 years, then there's something in it that you can say, gee, I did something that endures, that's timeless.