Question

I am a place where all deliveries are returned to the sender, those who perform better need to do less work, and a lot of things get knocked over, but generally speaking, nothing gets broken.

What am I?

Answer 1

a bowling alley

The bowlers always have their bowling balls, which they deliver toward the bowling pins, returned to them by the machine.
Bowlers who get one or more strikes (a strike being the best result) need to deliver fewer balls in order to complete the game.
The bowling pins are the things that get knocked over.