Look at Germany after WW1, horrible economy.
France...russia!
I think while war is a time for profit it can also be equally devestating on economies if not handled properly.
So it's not likely that people would go to war JUST to boost an economy.
On another note, the last bit you said lol...reminds me of EarthSeige...and StarSeige the 3rd part of that series.
Where corporations invented machines to do all the fighting. And what ended up as you can guess is the machines turned on humanity and plunged them into 20 years of death.
The average life span of a soldier in that war in the series was like a few days lol.
And it went on for 20 years, then stopped after they defeated the "Dark Intellect" but he came back and started an attack from the moon which went on another 2 years I think.
Then he escaped to pluto and returned some hmm...200 years later? And layed waste to humanity for another few years.
Awesome series






