I don't agree with the bribery system either. It's a bit ridiculous, and it really makes the kids expect treats, feel entitled to rewards for doing what should be expected of them without the treats. My co-teacher does stamps/stickers, then they get a treat once they get 20 stamps/stickers. It wastes a little chunk of time doling out 40 stamps at the end of every class. They're not working harder or anything, so the system isn't working.