These are a great Valentine for your kids to give away in class, especially since many schools have done away with allowing any kind of treats brought in to the class. I know my kids enjoy giving their classmates Valentine's, but they always like to choose the ones that have pixi-stix or starburst with card to give out to all their classmates. Usually I have to end up buying 2-3 boxes per classroom because there are 10-12 in a box, but 22-25 kids in the class. At $3/box with 2 kids, it gets pretty pricey - almost $15-20 for Valentine's!
These McDonald's coupons are cheap ($1/12), so now I'll only end up spending $4-5 total, my kids can still give out their Valentine's to their classmates, and their classmates can still get a treat. It may not be instant gratification, but they can get a treat (apple dippers, hamburger, ice cream cone, or apple juice) just by going to McDonald's. In my book, this is a win-win-win.
Another great way to use these coupons, I would think, would be to use them as rewards - rewards for potty training, payment for doing chores, special treat for doing well on a test, etc. Of course, I, personally, see nothing wrong with using an "incentive" method. If you do not raise your child that way, then feel free to modify this to fit whatever method you choose.