When I make a project, there are four things I look for.
Low cost: If the project is going to cost me a million dollars (exaggerated a little bit) I won't make it.
Easily accessible materials: If the materials are impossible to find (unless it is a really, really cool project) I most likely won't attempt it.
Usage: What will the project teach me? What experiences will I take away from it? If I had students, what would this teach them?
Simplicity: If the project uses 6 integrated circuits, I won't even try. Most likely, I will try to find a way to make it with a microcontroller. If nobody had done the project before with a microcontroller (unless it is really good) I won't try.
Therefore, when I found out I could make a motor without super-high tech stuff, I had to make one.
However, of all the tutorials I had looked at nobody had made it simple enough so average people could do it.
This would be great for classrooms because it teaches magnetism. My science teacher had one but he plans on getting more soon. It is small, cheap and easy.