I really don't understand. 30 presents in merchant costs 90 gems; but if you are missing just 1 collectible to make 10 in major house it costs 32 gems?
Huh?
So is 32 gems the price of 1 collectible? Is then the price of 10 presents made in major house 32x75? It is not, because after putting in production I now am missing 64 collectibles and finnish with gems is 158 gems. So there is a big question mark? What is the price of 1 collectible, or did you pull out numbers in your sleep?