Take a page from WOW – instance “gems” and honor badges etc – its all just currency like gold. So why must it take up bag and bank space – worse still, gems are not generic and are specific to the instance so you need even more space to store these.
Treat all as currency like gold which a player carries without using a bag space for each or requiring a bank space for each.
Sure – I could expand my bank with real money, but I should not have to do to just to accomodate this design. WOW came to the same conclusion after enough players voiced their dislike for all the badges they had to store.
GW2 mods can fuck it up their cock sucking asses – Sieg heil you nazi fuckers