I won't grind, ever. I accept bounties when I'm going to be killing in an area where I can get extra faction, but I hate grinding and refuse to do the same mindless task over and over again -- something I thought GW was proud to have less of? -- just so Pain Inverter will be worth a damn.
I don't want FoW armor. Dervish obsidian looks kind of cool, but for the most part I think it's awful. Those poor mesmers.
I won't be your healbot. Sorry, but I've done it before, and there isn't much in game that sucks harder than getting bitched at by a frenzy wammo with a chip on his shoulder. My monk is a smiter, usually, and she never PUGs.
I don't charge for Consulate runs. If I'm going to the docks anyway, I'll let people in for free and just remind them that tips are appreciated.

It's nice to get that extra bit of gold, but it takes zero skill and almost no time.
I won't spam for hours to sell something. As much as I enjoy this game, the trade system is complete and total suck. I logged in to play and enjoy, not spend hours in the city spamming WTS.
I won't join any alliance that demands a certain amount of faction a day. Especially if they don't even have a town.
I won't scam or cheat. Someone actually paid me slightly over my asking price once, and I PMed him to come back and get the difference. I know the login info for two of my guildies, including our leader. I've been given expensive items and rare minis, and returned everything without a second thought. Why yes, the view from my high horse is lovely, and thanks for asking.
I'm lax on other things, though. I see nothing wrong with Ursan or Sabway, and I don't curse at runners.