You know what they say about cosmic real estate... ROTATION ROTATION ROTATION
The seven Universes maintain balance -- that is the beauty of their number. To illustrate the concept imagine a spinning plate.
Seven universes are arranged evenly across the plate as it spins -- three universes on each side and one remains the center. Each universe must itself maintain balance, or the balance of all universes will be destroyed. With each bridge arises a TURN and the TURN is balanced with an act of ultimate GOOD and ULTIMATE EVIL.