> In fact our instructors are paid when students complete a task, not when students sign-up.

Interesting model. I like the thought of trying to align student and instructor motivations. Getting paid for engagement is a great way to do that.

I wonder, though, if it puts pressure on the difficulty of the tasks? Can instructors game this system (if they wanted to, as I'm sure most don't) by the types of tasks they assign, thereby potentially impacting the quality of your content?