Imagine how great it would be if ANet implemented a massive warehouse like at the end of India Jones - The Ark of the Covenant (run by Asurans no doubt). It could be based in Area 51 or my preference; Langley, Virginia. Everytime you picked up a collectible drop it would automatically get added to your secret storage facility and could then be called upon later for whatever purpose presented itself. Every single collectible drop in the game could automatically be added.
Either create a "Temple of Doom" mega quest that spans all four campaigns and requires quite an effort to complete in order to unlock the SSF (Secret Storage Facility) and / or require a purchase from the in-game store. Say somewhere in the region of $25 maybe. With terabyte drives down to a mere few $10's of dollars this might have been a feasible upgrade to Anet's servers.
*** Back from work with some new ideas :
The implementation might be in the form of accepting a quest from an Asura that gives you a "unique" (doesn't really have to be unique) combination of symbols / cartouches that you have to then go off and find. Perhaps dungeons drop them or maybe during some excavations in the Tomb of Primeval Kings they were found (might reinvigorate some of the game). Make them fairly rare to get and maybe you need to collect a unique identifier to gain access to the SSF, 10 - 20 symbols long. from an alphabet of possible symbols.
Maybe something like this:
Tombs run reward: 5% of getting one
Other dungeon reward: 2%
Random Drop from a monster: 1 / 5000
From the alphabet of A..Z mine might be: ABDASVVVIT
I'd go for some cool artwork here, like egyptian hieroglyphs (cartouches?). An ancient, asurian language. Maybe the background of each symbol can also be from a range of possibilities (the elements), so you might need an "A" on a redish background (fire).
These could then be traded with other players in order to collect your access code.
After having assembled your access code this would then grant you access to a new, elite outpost - let's call it The Pyramid of Doom (PoD) as a working title. You and other players would have to run the gauntlet of a new, fairly tough dungeon - like area and, having succeeded, you would then gain access to the SSF. Perhaps have the temple / pyramid on seven levels and if you fail then you're kicked out and have to start again. Maybe it costs a gold zoin to gain entry, so failure is going to hurt a little.
Make this area a little like The Deep; the team needs to split to flick switches while the rest of the team passes through, have rolling boulders, etc; think Indiana Jones like situation. Maybe have a Deal or no Deal element (once per level), the team can gamble on a 50/50 chance of either having something good happening (a group of crack commando asurians show up and help or a few golems arrive and help click some azz) OR the hourde is released; bad stuff is unleashed (release the kraken, plague of locusts, ... start thinking "The Mummy"), perhaps a mummy does arrives - powerful necromancer. The balance should be something like:
Don't gamble - good team has 67% of survival per level
Gamble and it pays off - good team has 85%-90% of survival per level
Gamble and it goes wrong - good team has 25% of survival per level
(whatever the maths / game balance needs to be to make it hard but not insane)
Once you finally complete PoD a cutscene has you and the lads (fellow team mates) standing as the camera pans back and you see the vast warehouse stretching out in front of you with working class asurians (mere PhD's amongst the standard nobel prize middle classes) going about their business shifting stock about. Perhaps Palawa Joko is standing at the customer service desk, arguing about some lost stock, "no no no, I want ectos, not shards!"
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