The reason that happened wasn't because the lady is getting kickbacks from the publisher, it was that she wanted to unload the setting of questions and the grading on someone else. It used to be that you had TAs for that when the workload became to large for the professor to handle, but we are seeing third parties moving into this market niche. (Hey! An idea for a startup!)
There is not enough information here to decide if the professor is lazy or the university is overworking her - we would need to know about her course load, class sizes and other duties. However, there is no excuse for this stealth increase in tuition, this cannot be allowed to happen.