I'm actually surprised that there's no policy on conflict of interest for these universities. It's one thing to be charging through the nose tuition, that's just further exacerbated by these professors that wring students for personal gain.
Writing your own book is fine, but manipulating these books EA style (where you buy a game that comes with a one time use multiplayer key, neutering your ability to sell it afterwards) on the thinly veiled "improvements" is just downright shady. I commented about this on the other math book to pdf submission, but I had a professor did just this. He basically shuffled chapters around and renumbered problems, making the previous year's book worthless because the problems he assigned are numbered out of the new book, and he refused to provide any mapping of new problem sets to old problem sets. I had mentioned this to the department heads and none of them really cared at all about this practice.
Writing your own book is fine, but manipulating these books EA style (where you buy a game that comes with a one time use multiplayer key, neutering your ability to sell it afterwards) on the thinly veiled "improvements" is just downright shady. I commented about this on the other math book to pdf submission, but I had a professor did just this. He basically shuffled chapters around and renumbered problems, making the previous year's book worthless because the problems he assigned are numbered out of the new book, and he refused to provide any mapping of new problem sets to old problem sets. I had mentioned this to the department heads and none of them really cared at all about this practice.