Short form:
Please allow us to pay $2 a month (the same price as one additional retainer) for access to an expanded Armoire that can store 1,000-2,000 gear items. It would take the same server space as one additional retainer. This could consume 1 of our 6 "additional retainer" slots, so it would not consume any more server space than is already allocated by the addition of the 4 new "additional retainer" slots with 3.0.
Long form:
In 3.0, SE is allowing us to pay for up to 4 more retainers than before. For $2 a month, we can expand our inventory by 208 items stored in the inventory-style (uncompressed), up to a total of 832 more items than available before. The reason they can't give us this extra space for free, they've said, is that it takes up server space. Previously they said they couldn't add extra space at all, but with 3.0, they've indicated that they can afford to do so as long as they pass the costs for the expanded server storage on to us subscribers. This post is not here to criticize that decision, but instead to suggest a more efficient implementation.
Retainer storage is uncompressed, just like our inventories. Items can be dyed, stacked, and glamoured. They have a condition, a spiritbond amount, an HQ flag, a Collectible flag, and a maker's mark. They can have up to 5 materia melded to them. That's 11 extra pieces of information unique to that item (plus two 1-bit flags) that must be stored in addition to the item's ID. Maybe not all of it is equal, so let's say that the extra information takes as much space as 6 additional item IDs (the glamour pointer has to take as much space since it's also an item ID, the maker's mark has to link to any player (or store any length name) and takes as much space if not more, and each of the 9 other items should each take ~half as much space as an item ID, not counting the two 1-bit flags).
A form of compressed storage already exists - the Armoire. This storage method compresses the data by stripping out everything except the item ID. There is no stack size, no condition, no spiritbond, no dye, no glamour, no materia melding, no HQ/collectible status, and no maker's mark. If all the rest of that data takes as much space as 6 item IDs, then armoire-like space can store 7 times as many items for the same cost in server space. Instead of paying $2 per month to store 208 additional items (in addition to appearance data, experience/class data, current venture data, a retainer location, and the order of the items in the retainer's inventory, all of which should cost the same space as ~5 more items), allow us to pay $2 per month to expand our Armoire.
This expanded Armoire could, for the same amount of server space, store 1,000 to 2,000 items (my math approximates it at ~1,500). These would be equipment items only, but have few other restrictions (e.g.: I could imagine Zodiac Weapons not being storable because of Light/Mahatma/etc). These items would be stored and retrieved just like all other armoire-able items - they lose their dye, spiritbond, glamour, maker's mark, melded materia, and so on and must be stored with 100% condition. All items retrieved from this armoire would come out bound to the character (no need to store the bound status).
The Armoire already exists, so this new feature doesn't seem like it would take much in the way of coding. Add a new Armoire tab. Add a #/max counter if desired - it's almost unneeded. Add an error message for trying to store any items past the limit. Auto-sort the list alphabetically, which I think is already done. This is a very small cost for what I feel is a much-desired system for collectors/completionists like me.
Please. If space is at such a premium that we cannot be given extra inventory space in the expansion for free, please allow us to obtain extra space in an efficient manner. If we can't have a new glamour system that is more like that of other games, give us a way to pay for more glamour space just like we can pay for more glamour options. Right now, the only option is rather space-inefficient, which goes against what we've been given as the reason for the limitations that are being imposed.
I'm not trying to be critical here. I'm not asking for a handout. I'm trying to offer a solution to what I see as a major roadblock to my method of play. I'm sure I'm not the only collector (Diamond, in the card suits model of MMO gamers) who plays FFXIV. Not only that, the collectors tend to be the ones who buy optional services (they're called "Diamonds" for a reason :P). Please give me a way to give you more money per month so I can play the game the way I want to, the way ~25% of MMO gamers play.