Right. I would buy this if:
1. You could not rush with money
2. The soldiers came out as anything but newbies
3. Any military in the world spent more than 90 days to judge a soldier fit for combat as a grunt.
4. Most (nearly all) of the production cost wasn't due to equipment.
5. Production time depended on the ease of use of the weapon. (spears -> swords -> bows -> slings, in order of harder to learn)
No, the three turn limit is pointless. Right now, it's trivial to go around, I'm just afraid that the developers are going to enforce it harder and harder, and would like to know why.