I do not understand cosmetic economies. Obviously, if you could directly buy anything, for a decent value, you would buy the stuff you wanted the most (in a price tier) first & maybe not have anything to "work towards" in a live game (unless ongoing content previews have you interested). But eg Avengers has a random loot box (each month carries a different subset of possible cosmetics) that you can buy a hundred of (guaranteeing one named cosmetic) for less than 1 store "rare" cosmetic.