A high school teacher in the U.S., with 10+ years of experience, makes about $65,000 per year -- on average.

There are generally 180 days of school per year.

Let's say she teaches 5 classes per day, 20 students per class.

That works out to ~$3.60 per student per class. Classes run about 40 minutes each or ~$0.09 per minute.

I know there are many variables affecting this calculation but if screencasting is about delivering consise, high quality instruction, consistently, then $0.10 - $0.15 per minute does not seem unreasonable.

Nor should $0.20 per minute ($12.00 per hour). But it's interesting that it does.

Compare that to what an undergraduate student pays per minute for a lecture given by a TA to he and 200 of his closest friends.