I have had several professors who taught course requiring their own textbooks. In every case though, the textbook was made available at printing cost or given a

I have had several professors who taught course requiring their own textbooks. In every case though, the textbook was made available at printing cost or given away for free at a cost to the professor, since they also felt it was a conflict of interest to profit off their class requirements. I would definitely drop a class where a professor started a semester by doing something so ethically gray.