How about offer both the RNG/gamble box and the items in the shop. I'd love to just purchase the Christmas themed outfits but I'm not going to buy boxes for a 1-99% chance. I've spent over 700$ on Path of Exile, probably the same in Rift (only a few of the Legendary Lock Boxes) and about the same in Tera. Tera is the one that got me to stop with the gamble boxes. So now I'm at a point where I'm not going to buy keys or boxes. If you want to charge 50$ for the Christmas stuff, do it. You can leave them in for those that like to gamble. How about you take an idea from Path of Exile. Sell packs that offer in game items (cosmetics, portrait frames, weapon skins, tower skins, etc), some physical items (t-shirt, stickers, key chains, etc) and some gems. Then you can offer tiers (again similar to PoE). And you can add in a 'create a unique mob' or 'create a unique weapon' pack for a few grand (PoE charged 10k for this, btw).