You're banned because wouldn't that make your penguins stuck? And if I pushed you hard enough, its possible the fall plus the magnetic force could equal a couple breaking of bones.
You're banned because the shoe locks on the foot (Or in this case, flipper) and unlocks itself at the top of the escalator. Also, no penguin is strong enough to push another penguin off the escalator.
You're banned because it's hard to access my space igloo for several reasons: First, it's in SPACE! Second, my guards use VERY heavy pillows. Third... well there is no third.