If you never reward a good job... there's a possibility that it could go the way it went with me: simply to stop doing anything. Easier than working for nothing with no foreseeable benefit in the future 
I don't believe teachers enjoy dealing with someone who aces their tests and doesn't do any homework
And I know that parents don't enjoy feeling completely unable to get their children to do any schoolwork.

I don't believe teachers enjoy dealing with someone who aces their tests and doesn't do any homework

Please give me a home where cloud buffalo roam
Where the dear and the strangers can play
Where sometimes is heard a discouraging word
But the skies are not stormy all day