Feedback suggestion: get more points on course mastery challenges!

Hi there!

Just wanted to share an idea to improve the point system: KhanAcademy should award more points for doing course challenges as they take considerable time and concentration. I spent 2 hours doing the physics course challenge and only received 440 points - at the same time, I could have spent 3 minutes watching a video to get 875 points...

Let me know what you think!