You go to the bookstore, and you realize the textbook for the new course you picked this semester costs over $300. Guess what, herr professor is the author, and is pocketing every penny of the money. How can they do something like that to their poor starving students?

Next thing you know, he gets a tenure, and for the rest of his natural life, students are forced to buy his crummy textbook!
Makes you buy text book he is the authorMakes you buy the expensive text book, he’s the author!