For us, I would say the "incentives" are:
1) setting a good example for 3 younger brothers. If they see oldest getting away with it, why would they comply?
2) for the sake of family finances. If they can get scholarships, an enormous amount of money is at stake (4 kids). This translates directly to hours my H spends outside of home. I want them to understand that goofing off (when it'd be simple and virtually painless not to) makes Dad have to work more, play less, have a lower quality of life.
3) personal satisfaction
