So you want $9 to teach about bitcoin, this is just like come to the free investors lunch, it be $150 for the materials you need. Dude make it free come on, obvious you just want to make a buck, but seriously if you want to tech about bitcoin make the course free I think people would donate. But don't ask for a donation and make the course cost money as well. That is just being greedy, not a value that a bitcoiner should have.