I agree, it is a bad assumption. Not everything has to be about money.
In the last 15 years, I have averaged over 15 hours a week writing Creative Commons licensed eBooks and the open source code that goes with the books. Even though a few people choose to buy my books rather than take free copies, I do this with no expectation beyond hoping to meet interesting people and improve my networking.
In the last 15 years, I have averaged over 15 hours a week writing Creative Commons licensed eBooks and the open source code that goes with the books. Even though a few people choose to buy my books rather than take free copies, I do this with no expectation beyond hoping to meet interesting people and improve my networking.