I shouldn't type messages while in a conference call.
The point I was trying to make is if you want to sell to anyone outside of your guild you have to own a keep. There are no centralized AHs so every keep will be it's own little decentralized mini-AH. So, if you want to buy potions, you have to hope you can find a guild who owns a keep who sells potions in your campaign or guest campaign. Oh and if you don't like PvP but you want to sell your crap you have to join a guild who owns a keep or shout in /zone until you are blue in the face. (Sorry, no global /auction channel)
Another fun part about the system is that the first person to the keep merchant can claim a keep. So, if your guild fights for 2 hours to take over a keep a_random_person01 can run straight to the merchant and claim that keep for his guild even though you did all the work.