8-12B a day? That's laughable actually. I know people who do 20+ a day. All you have to do is make 4 archers and trade gear. Each archer makes at least 1B an hour.
Feoh cannot do what archer there does. Archer easily does 1b, feoh with TOP gear can do 750-900m an hour, which still is a lot.
Don't worry, balance is coming. Tyrr next update gets a big boost, just not big enough to cover the damage that has already been done.