I am not one to complain, but this just doesn't make since... that you can only buy recipes from the school tree that is your primary school. I can make my own treasure cards out of my school cards cheaper than buying the recipe from my school tree. All I have to do is buy keen eyes and combine my cards in a simple battle and I create all the treasure cards I want of my school cards.
What would make since is that we could buy recipes for cards not in our school. We will still have to get the cards/reagents together to craft them. And crafting is limited anyway because of the slot time restriction.
I can understand you guys want us to buy crowns to get the items we want, but the above restrictions just don't make since.