We did a research study sponsored by the U.S. Dept. of Ed that showed that for learning basic skills, black-and-white screenshots are best. Walking people through tasks step-by-step with static pictures is most effective. Video is really good for some things (showing the correct hand movements to operate an iPhone, for instance), but for basic "click here" stuff, simpler is better.

That is very interesting.

At the college I teach at we have courses for administrative assistants and I thought perhaps you could sell courses that are cheaper and better.

Good luck on figuring out how to monetize your site.