I don't mind seasonal events being segregated to the cash shop, though with Lightning returns, I do think they could consider making that a Golden Saucer item.

For those who have seen the screenshots of the Golden Saucer their is a Gilgamesh vibe to some of the areas suggesting that the production of the Golden Saucer and it's entertainment value also took inspiration from the mysterious traveler Gilgamesh, a being who from past FF titles is known to traverse dimensions and obtain the weapons of defeated heroes.

With that in mind placing a "special event" item like Lightning or Snow's gear would make sense since the Golden Saucer could be seen as a place that celebrates the oddities and strange people that make their way into the area.

Heck maybe we will be in for a surprise and when they release the Golden Saucer they might actually include "Setzer" in some way as to why his gear is obtainable through the golden saucer.