I noticed an odd thing today when creating collections. The cost of collectibles is not the same for all collections. I was missing four Food Carts to produce more Potions of Endless Energy and the price to complete it was 114 gems now obviously I'm not going to pay 114 gems for four Food Carts but then I noticed that to complete the Harvest Ritual for which I was also missing four Food Carts, I would have to pay 54 gems. Worse, for two Food Carts to produce a Sip From The Kettle it would cost 102 gems. So a Food Cart is worth 13.5 gems if you use it for one thing but 28.5 or 51 gems for other things. As paying to complete the collection still uses the other ingredients that I have (you aren't paying for *all* the ingredients just the ones that you are missing) I don't see why that is.