[Endoperez]

Enemy dominion doens't affect your income straight, with the exception of C'tis Miasma IIRC, but Ermor's dominion kills population *very* fast. Pangaea: Carrion Woods does that also. And if that nation's dominion takes your provinces' scales to negative, that will hurt you. I think enemy dominion also increases unrest, and that in turn lowers income.

Upkeep is not based on troops' size, but recruiting price. 1/30 for most units, 1/15 for sacreds. So remember to watch the number of those mages! Supply use is based on troops' size, and you might have confused it with upkeep.

Wineskins are more cost effective. 5 gems for 25 food is worse than 20 for 50, but You can forge 4 wineskins for 20 gems and get 100 supply points... If you give them to four commanders, that is. Wineskins don't stack with wineskins, cauldrons won't stack with cauldrons, but wineskin and cauldron on the same commander will work fine.