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Nah... It seems now that the more factions there are, the better and more interesting it is, and so on. But in reality, you'll play for a month, and it will all get boring. New factions will stop being new, and the interest will fade. In my opinion, right now, the balance is perfect: four factions that are conventionally evil, and four that are conventionally good. And if you were to add any, it should be at most two – one good and one evil.