Can you point me to any references that back this up? I am interested in reading more about this.
^This isn't the straight answer you we're looking for, i must say the bitcointalk forum is the worst place in the world where you would look for support or opinions on your projects, it happened to me too.
Put it in practice and see what you get, i did get your point and you're right, kinds tend to respond really well when they receive something in return, it is our human nature after all. They would love those classes and kick between each other to attend first. You could raise the "bar" whenever you want so they have to spend more time and effort to memorize or give out creative answers if they want to get the prizes too. I see it has allot of potential.