Somebody could make money from me by offering an accredited, for-credit course that mostly tests my understanding of a subject gained from reading I have alread

Somebody could make money from me by offering an accredited, for-credit course that mostly tests my understanding of a subject gained from reading I have already done. What I dislike intensely about MOOCs is that I still have to watch lectures (they are often mandatory, and are especially likely to be mandatory if you are taking the course for actual accredited credit). I can read much faster than anyone can talk. Prerecorded video lectures on MOOCs can be played back at double speed, but they are still linear-access rather than random-access that the way a well indexed book is. So I think there is still a market for online courses, but with the testing being more online and more decoupled from the instruction as such.