As long as it's pure cosmetics I don't mind really. It's better than the F2P model where you can get gear, character slots, hair colors and some other silly stuff only if you throw 50$/m. We can already have tons of mounts, minions and outfits just by playing the game/adding subscription days, and I think it's fair for you to "pay extra" for an item that you were supposed to be subscribed to get by the time the event was up. If I had paid my subscription on, let's say, the New Year's event, I would get "free" outfits for 15$. But since I didn't those outfits are $5 each. It works like "paying for the subscription you haven't paid to gain acess to those items by that time, they're supposed to be exclusive, y'know". Some games doesn't even do that, and event items get locked behind being "rare" forever.