What do you guys think about being rewarded for high marks in school?

Thinking about developing a Blackboard/Moodle plugin that rewards students in BTC for good grades. I haven't done much research on the effects getting paid for good grades, but I would sure try harder if there was a tangible reward.

The way it would work is that for each assignment, the instructor's final mark triggers a BTC transaction from an 'assignment pool', depending on the grade and originality score. I wouldn't call the reward 'bitcoin'. I would call them something like 'class credits'. I would also provide instructions on how to use them to buy something, or exchange them for cash.

Anybody have input in regards to incentivized learning?