
-Character Slots (would've prefered included in campaigns, but this works too)
-*Campaigns (includes CE/Preorder but limited, see below)
-Guild Wars Soundtracks / DirectSong Packs
-Choices for Login Screens / Interfaces (able to toggle em)
-Merchandise
+T-Shirts
+Customizable Coffee Mugs (Skills/Char/Boss/Name printed on it)
+Plushies (Possibly the B-day presents one, so it be a yearly series)
+Etc...
Things that should not be sold in the store:

-Expanded Storage/Tabs (should remain as update or come with campaign)
-Gold/Materials/Weapons/Armor of any kind (be it vanity or not)
-Emotes (once again, free as update or with campaign)
-Character Apearance/Name (should be npc, available to all and cost in-game gold)
-Skills (allows for unbalanced gameplay)
-Guild Halls/Guild Upgrades (remain in game and in game gold)
-Auction House (included as either global update or with campaign)
-Mini-Campaigns (keep as update if more "minor" content for all to enjoy)
-Minipets*/CE upgrades*/Preorder Items*(Reasons/Situations listed below)
*Collector's Edition/Preorders/MiniPets should remain a time based limited release items. As far as Minipets go, they are a reward for staying with the game for so long. I understand that after you receive them they are yours to do what ever with, but allowing it to be bought for real cash lessens its value and collectibility. For CE/Preorder's, I think it would be best to have them on the site for a limited time. Such as the CE/Preorder would be available for purchase before the game is released (just not playable/usable until it's opening day) and then after release in stores, Preorders would be taken down and CE are available for an additional 1-2 months. If they are available indefinitely, they become less valuable and even less worthwhile then now.
Lastly, I don't want to seem shrewd/cheap for my opinion on the No's list. It is just my opinion (as well as others out there) that if we start paying for in game content (be it useless or not) we are nickel-and-diming ourselves to getting closer to becoming pay monthly game. I joined GW not only cuz of no monthly fee, but that as long as I keep up with the campaigns alone, I am on equal footing as everyone else who plays legally. To start legally allowing special content/items to those who can afford may/may not unbalance in game economy, but lessens the joy one might feel when they do get that special item, or leaves player feeling abadoned becasue they didn't want to shell out more money for content on top of paying for the campaign. While a majority of the items of the No list should be available (ESPECIALLY storage), it should remain as a in game gold transaction or update, and not a real life cash transaction. Sorry for repeating alot of what was said out there (completely agree with you "The Shadow"), but im just giving my 2 cents.