Tomcat51, that's the Law of Conservation of Ninjitsu, and it's a well-known principal.
We need a ruleset that reflects this - the point cost to add a veritable horde of ninjas to your team is actually less than the cost to add a single ninja, but that single ninja is far more lethal than the horde even when they swarm your opponents. (In fact, swarms of weak-sauce ninjas actually act as ablative armor for your opponents, protecting them from your other hitters by generating comical friendly-fire incidents...)