Here is an idea that I discussed with some people in my guild:
Guild Traders in Cyrodiil.
Where you pay with AP instead of gold.
You auction for the guild trader with AP (will probably have to introduce a new mechanic to deposit AP into the guild bank)
You buy items with AP.
This way, people who strictly PvP and have hundreds of thousands of AP but no gold can buy and trade items that they otherwise wouldn't be able to.
Gan Xing - Crafting Nightblade
Elrana Tinuviel - Hybrid Dragonknight
Elentári Peregrine - Sorcerer "bank"
Rán Xīng - Hybrid Templar
Laurïsil Imlachwen - Stamina Templar
Helotë Tinuviel - Hybrid/Magicka Warden
Odin banker - obv banker
Yan of the Red Mountain - lvl 3 DK - not sure when I will work on em
Seeks the unusual and unique playstyles...