Nope, lower center of gravity is better for balance. As the center of gravity approaches the pivot point (the broom gets shorter and closer to your hand) the object becomes more stable and easier to balance. You can't compare a broom to a ruler because of the size of the base and the weight. A ruler is difficult to balance because it has a very thin, asymetrical base that is more prone to tip the whole object over. A better comparison would be a full length broom (~5 ft or so?) to a cut off broom handle (maybe 1 foot?).