I wouldn't consider being a teacher something similar to business but more like an ONG. I don't mean to disappoint you or anything. I share the sentiment of 'evangelization'. Just, perhaps, share the idea with your teacher beforehand. Plan ahead, another comment mentioned dual-license, that could be an interesting take. Same goes for what many platforms do, which is charging for support (e.g. research for Red Hat Enterprise Linux business model). Good luck!