So I was thinking it would be cool if KI offered a set of cards for 100-200 crowns per pack, and once you completed the set (possessed each card from the set) you get something extremely rare. The rare item could be a pet or a house or combination of items.
It would give people incentive to buy more packs and KI more money. YW for free business ideas btw KI, feel free to give me a job anytime :D