Will people really do more things that are harder if they're having fun while doing it?
I sure hope so because making work fun turns out to be one of the driving factors in getting our school work done around here. Math seems hard? Change the story problem from Miss F cutting pillow cases to ninjas eliminating the enemy. Copy work too boring to survive? Find a thrilling passage from Harry Potter. Practicing new spelling words while sword fighting with mom, you get to take a stab for each letter.
Seems some people in Sweden actually study how fun affects people's behavior. Check it out!