A teacher has the duty to do extra work in order to do a better job. There are two main things that a teacher is urged to do during the 10 hours weekly in non-teaching activities. And they are the planning process of the classes and the other activity is grading students' exams or workshops.
I believe that it is morally wrong to emotionally manipulate companies audiences just for ads. I think there should be strict guidelines as to what you can and can not advertise.