Sure, and that's the reason why it should be even more expensive. Otherwise there is really not much to think about.The main reason why I still find Arm very much worth building, is the sad fact, that since manpower is the limiting factor for army size for pretty much everyone but china/japan, the cost of IC investment is almost irrelevant in the long run. (Edit, meaning that IC cost wise, building just infantry should already be more effective than armor)