For the first two weeks they only wanted the immediate gratification of getting things out of the cans. But after they started saving --and combining--their piano bucks they found they found they could get more quality prizes.
This is so fun for them (and consequently for me) and they are wizzing through their piano exercise book. They practice whenever they get a chance...so much that we had to put a "cap" on the number of piano bucks they earned in a day (five). What is more fun than rewarding them with prizes is seeing their piano skills improve, and seeing how delighted they are that they are learning faster. An additional plus is that they are getting a good introduction to how money works.
We've being doing piano bucks for a little over three weeks now. I'll give you a report at the end of the summer on how it went over all.