In a high school game (going as far as to assume that there were no scouts there for college recruiting
), I think it would be reasonable to take it a little easy and let them have a shot at a few baskets to make it a little less embarrassing for the other team (if nothing else).
If you think you clobbered them down to 0-80 and they are going to miraculously come back to win the game if you don't play 100%, you have read the tortoise and the hare too many times, my friend.
Even the Harlem Globetrotters don't shut out the their opponents. Who wants to see a 100-0 game?