What do you think about having two pools of $$$. One is the local money, that is the money of a nation you control, which can only be used in this nation. The other is a "global" pool of money which you can use in any nation you want. One $ can be subtracted from every nation you control at end of the combat move and be added to this global pool. Thus even if you may earn less each turn than your opponent, if you own more nations you will have a larger global pool of money which means more flexibility.
Another way of spending these global $$ can be to implement a constructor unit. By drawing from the global supply it can construct fortifications, bridges, or maybe warp gates that can transport your units to other warp gates across the map. These gates could also function as a spawn point for units purchased with global money.
Just some thoughts...
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