He writes some of the best articles I've ever read on topics like productivity and motivation, but he also makes money by teaching you how to make money.

The motivation for this decision is understandable - if the company can find some already written software that does exactly what's needed, it saves time and money.

A lot of fame and money can be made by scientists who make amazing or unique discoveries, and while this generally provides a motivation for good research, it is occasionally abused.