[quote=ASTA]
>Implying an organic army is any cheaper.
[/quote]

A grain farm can make grain again and again as long as it is cared for. A iron mine is worse than useless once depleted, it's a giant fuckin' hole in the ground that you can't do anything with. Plus, unless you entire army is tricked out like the Kabal Exodus, the metal cost is much, much lower.