I forget the details of how/why this is but, you know how there's a 'premium' charge, for picking more than 4 of a unit type? Well, there's some kind of discount system for archers, where you are not penalised so heavily for a 5th archer unit. It's possible that this is done by a simple subtraction.
The problem with that is the valour/weapon/armour upgrades use a multiplication formula and it seems this is magnifying the size of the discount!!
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