This may somewhat resolve itself in the voucher system I'm looking at now.
Weapon merchant ... to get a steel battle axe costs 4 steel vouchers at 2500 gold each.
That is 10,000 gold.
4 copper bars = 500 gold, so if I smelt 80 copper bars it is worth one steel battle axe.
Compare this to fishing.
3-4 fishermen consistently pulling fish out of the river nets me 500 gold on a fairly constant basis (if I eat no fish). You will have money coming out of your ears. Same with hunting if you can kill big things.
Selling crops is a complete waste of time. Each plant stack creates one seed which creates one new plant stack which then must be used to brew a drink for sale, consuming a barrel or pot in the process. You lose money selling agricultural products.
So a small fishing village by the sea, a lake, or river with its primary vocation being fishing will be ROLLING in gold while the village with access to underground gold deposits will be poor.
ETA:
Ok, checked the math before I posted. There DOES seem to be a way to generate income based on brewing.
If you buy plants, they come in stacks of 6 for 500 gold. Since the still will use a whole stack for a drink, you can't make a profit by selling that drink.
But if you produce seeds and then plant large fields of the stuff, you will get a stack from each set of seeds you planted, which can then make a large batch of alcohol to sell, and generate new seeds for a constant renewable source of income. It's harder than fishing, but if you paired it WITH fishing then you would be ROLLING in gold.
--- Theoretically, anyway. Needs some testing to see how the individual stacks are consumed.