Well, obviously you wouldn't make them the same ones. I mean, Mystery Boxes don't drop the Sweet Candy Stripper costumes, do they? Why would you, when you can buy that one straight from the AP shop? Do you put prizes in Mystery Boxes that also drop from bosses? I wouldn't think so, because why spend money on those when one can just farm a boss for it?
So you have a lot of costumes in the game, right? Let's call them, for discussion's sake, Costume A, Costume B, etc. and on down the line. So you would have like so:
AP Shop = Costume A, B, C, & D (but not all at once, see first post).
Mystery Box = Costume E, F, G, H, I, J, & K (or however many you want, just like now)
Boss drops: Costume L, M, N, O, P, etc., etc.
And that isn't even including mounts, pets, weapon skins, et.al. I'm just spit-balling the idea of putting 3 other costumes into the AP store at different times of the year. If nothing else, just to break up the monotony.
It wouldn't take anything away from the Mystery Boxes, the raids, the world bosses, because... those reasons.
As an aside, isn't it all the same money, whether it gets spent in the AP store or on the Mystery Boxes? I mean, unless I am missing something, doesn't it all come from those Pixel Game Cards? Why would it matter how one spends their VGN points?
I'm sure the ROI in terms of the effort required to implement this probably just isn't there. I get that. It's just that the AP store is kind of like your refrigerator on the day before payday, y'know? You keep opening the door, expecting to find yummy food has magically appeared in there, but it's exactly the same stuff that was there the last time you looked and it isn't going to change until you go to the store, buy you irrationally keep doing it all the same.
Anyways, thanks for reading...