5k gold for 12 Cards? I really wonder about the size of your server now. I'm on high pop, herbs are 20-25g a stack, and 1 stack = 1 Starlight ink
Cards might not sell well, but trinkets? Man, I make 12-15 every month (got 6 scribes), I buy out Decks for 4000-4500, and I buy all cards under 300g to finish decks.
Then I wait 1 week until other sellers are out of stock (they sell for 4-5k) and then I dump all of mine for 6-7-8k. Best thing is, I still don't have enough because week before new DMF I'm out of stock.