That makes sense. Giving rewards changes the rules of the game. The objective becomes getting the reward rather than joy in the use of talents. Alfie Kohn, a commentator on psychological nonsense contends that the quality of performance actually declines when we start rewarding people. The reason is simple.
Rewards shift the focus from performance and expression to reward and self-interest.
Many a parent has tried rewards to motivate children only to find that their children become very savvy at negotiation, stalling, and even strikes. If we live by manipulation, we die by manipulation. Children are not pliant clay that can be made into anything the parent chooses. Children are not mercenaries who can be bribed into goodness. Children are offspring of God with divine natures and eternal destinies.