It's like a teeter-totter. If you want the other end to go...

It's like a teeter-totter. If you want the other end to go up, you don't just stick two dumbbells in your hands. You move as far away from the middle as possible. By increasing that dimension, we get more effect than any amount of weights we could put anywhere else. No amount of weight you move will affect ball flight as much as changing geometry.