...4-6 or 8 spots in the shop for rare items, make these spots dynamic so change the items time to time, maybe asking the community which group of 4,6 or 8 old rare emblems, they would like to see again in the shop.
Too in the old times when we had a poll to vote for 1 item between 2, the non winner wasnt added so, could be cool too include discarded designs.