commercial doesnt need the goods, we are not playing UC here.
Goods are only for the popuilation and even high land commercial players dont have more than 400k pop for 400k land, except maybe a few that have 400k+ land, and the income boost SHOULD be minor compared to the comm income thus not needed.
Hell...even goods for tax empires are NOT NEEDED, just highly desirable.
Sinple way to stimulate more CG empires is to make commercial require goods to turn max profit also. I always found it weird that commercial needs nothing to make money. Were do they get the desks, computers, paper and other expendables needed to make commerce work?