...all the other news topics have so few comments...

....as a former math teacher, I can assure you that teachers rarely get to make the purchasing decisions regarding textbooks. Teachers, even most rookies, can tell when a textbook is bad, but have to use what they are given for the most part. They are free to supplement the curriculum with their own created content, but of course they are expected to mostly teach the state standards with the given textbooks.

The hours that teachers are paid to be on campus offer little or no time to actually plan instruction. Most teachers do this planning in their own time - how is this then the property of the school system? Not that I am advocating new teachers purchasing the plans of experienced teachers...new teachers (such as myself) need to create their own plans as part of learning experience. But in principle, I see nothing wrong with teachers selling what they have created.