well there are 2 things you need to kind of do for maximum abuse it
1- get cree ally and get the cost down to 450
2 - stack yield upgrades (US has a card that increases base yield better stacking)
So you get more like 2250 food for 450 wood ( which you can just set factories on or even have vils gather them cause you gather food at like x2-3 speed of mills) - its decent for volunteer spam
The other way to abuse is is that if you are italy playing team games