For the school donations like the American Heart Association thing (please look at Product->Warranties/Guarantees for more info on that) I know that the Yankee Candle Fundraisers or maybe the American Heart Association as well, but at least somewhere, (I don't quite remember where) would offer a big prize that was fairly expensive, usually some sort of technology, and would be given to the kid at the school who raised the most money. That way, those who were trying to get donations would want to try to get more even after reaching the highest level of donations. For example, I could offer a hoverboard or a drone, or something else that kids would want to have. If that was too expensive, there were also prizes for the class that collected the most money, like an ice cream party, which could also work, and would probably cost less, though it might be less of an incentive.