Amen. We were continually screwed in college back in the 70s. They hated letting us buy used textbooks. So, revise a page or two in the book and require us to buy the new one for the class. That happened a lot.
Another little trick that they used to pull was requiring us to buy a brand new book and then when we got the class they only wanted to reference a small portion of the book. Maybe one chapter was all we were required to read out of the book.
I had a statistics class in my junior year and we were required to use the textbook that coincidentally one of the faculty members had written. It was an open joke because with the book, term after term you were given about 20 Xerox pages correcting errors in the book on the first day of class.
I found it quite telling that the professor who wrote the book and probably the whole department were not in the least bit chagrined.
“Maybe one chapter was all we were required to read out of the book.”