Having many moons does sound like fun. Take Jupiter, for example. He has dozens of moons - almost a hundred, some named, others still waiting for an identity. Jupiter's orbit is thus pretty crowded - think of much chatting all those moons must have, all the time. But Jupiter can handle it. It's a big planet, it would feel so bored without his little friends. But we are not like Jupiter. Earth is a mcuch calmer, much more patient planet. The relationship she has with the moon is sacred. They both don't talk much - they just silently look at each other, all the time, with love in their eyes. Another moon would be just too much - and Mother Nature had understood it already.