If the Aatrox skin and future Vayne skins don't have a time limit in the shop.
If they stay there for months on end. So I don't feel like I have to rush to spend $100 in three weeks just to get it before its gone.
If by the time the Chinese New year event drops, the Aatrox skin leaves the Prestige Store, I'm going to be very annoyed.
Edit - I realized its there until 2020, which makes me a lot happier, I know it dosnt justify the $100 price tag, but for someone like me who spends about $100 each update, I'm fine with it.