aren't 2 and 3 the same thing?

When I was in college I had two classes where the professors taught from a book that they had written. The first one felt so self-conscious about this that he would refund his royalties to any student who presented him a receipt showing they bought the book. The second put all the homework in tear away sheets at the end of the book and wouldn't accept photocopies, forcing everyone to buy his book new. I never reported the second guy to any ethics board and I still regret it.