You don’t need to be a Middle School or High School Science teacher to appreciate the amazing resources provided by the PhET website. This site contains the most incredible collection of research-based, interactive, Physics simulations anywhere on the Internet. Best of all, these simulations are free to use online or download to your computer.They are a must-have for teachers with Interactive Whiteboards in the classroom.
As I said, making a profit in education is not the issue. However, when the method you use to make a profit interferes with the education process, then you might want to re-think your motives or your approach to sharing education resources with teachers.