One consideration is teaching materials. In many ways, it's more expensive for post-secondary institutions to operate in French. Teaching materials are one example of that. In general, textbooks in French cost more than English ones.
Francophone post-secondary institutions generally advertise in French and English. Anglophone institutions don't advertise in French—very little, anyway. There are many such differences. Even getting provincial accreditation for new programs requires teaching materials to be translated to ensure evaluation is based on—