[Soyweiser]

I have potential explanation for the 10 times increase.

You probably took your income after the reduction of upkeep. Say 80% of your base income is used for upkeep. So each turn you only get 20% of your total income in gold.

Now for example, your total is 1000 gp. And you have 800 gp in upkeep costs. Then you only see 200 gp in your treasury each turn.

After casting GoNB, assuming dom 10 everywhere, your income becomes 3000gp. After removing 800gp upkeep you have 2200gp in your treasury. Which is 11 times more.