But if you want to substitute "established business model" for "corruption", go ahead. I must say that not all of them were bad.
Roughly half the textbooks required were published by UNISA press, with authors being the lecturers themselves. With one exception (Delphi programming), all the books published by UNISA press were free with the course.
It's astounding that +3 decades later, it is still not profitable for any other university to do this!