My only convern with the ffxiv duct tape. Is everyone will sell it and there will be no real money to be made from it.
Also WoW a western mmo, has a repair system >.>. Most western rpg i've played have a repair system.

But in away this might help the wards out a bit. First off, this will limit the inventory issue people made for themselves. This will also help retainer storage and useage. Pretty much people will sell gear and dark matter. Maybe even mats for gear. Heck maybe the npc venders selling it will be at a decent price that it will be a decent gil synce. So though I think a ffxiv duct tape item is kinda dumb, it is growing on me. But all in all it is a silly idea and I cam just see people making red neck jokes about the item.