every unit has these fields
Stats - Gold Bounty awarded - Base
Stats - Gold Bounty awarded - Number of Dice
Stats - Gold Bounty awarded - Sides per Die
as you can see, this works like a real dice, it has:
-"Base" the base value of each side
-"Number of Dice" the number of the dices are you throwing
-"Sides per Die" the sides each dice has
as example: Base 3, Number of Dice 2, Sides per Die 4
it will throw 2 dices, each dice has 4 sides, each side has the base value of 3, the results could be between 6 and 24 (with increments of 3)
so if any of your values is 0, then you could get no bounty at all