Since I have tendecy to highlight some points of common courtesy and rules matters every now and then, I'll continue it with noting the common courtesy matters which have been highlighted this year...
Ignoring NPCs / Environment
Mostly in Bazaar, a lot of tendency to perform stuff which the guards would likely react to, obviously just around times Hardhead PC isn't there :P yet all the NPCs are not so smoothly ignored. Use more clever means, lure people elsewhere, or follow them elsewhere, if you have to attack them out of spite, do so in place where there logically wouldn't be gazillion NPC witnesses, unless you're ready to face consequences...
Or if you're just up for a spar, well then there's arena to use for that. Bazaar is not a cantina in Tatooine where everything is just shrugged as casual.
Ninjalooting / Loot theft
If you didn't kill it and you're not alone in the area, leave it be for now. That's good rule of thumbs for things, if nobody is in proximity and aren't engaged in combat, but still aren't claiming it then go at it, but leave them opportunity to resolve it anyway since likely they earned it more than you did, unless you killed them. While in groups, learn to share, yes, even the trash such as scrolls/potions/lesser gems/weaker magic items, reasoning being simple... despite them being "trash" they are still profit, profit which could be shared with everyone. Everyone wants more jink, not just thyself.
Good way to do this is to just pick one loot bag every now and then, ignore couple subsequent ones and then pick one again... take your share of the "trash" without getting greedy, if you really are out for greed, don't group up. It'll make it much easier for everyone.
If you want to roleplay greedy, roleplay it properly and give everyone a chance to get their share anyway through roleplay, and not just snatch things and use it as excuse to get whatever you want and whenever you want.
Group behavior
This per say isn't 'that' bad, but generally if you join a group, perhaps it's best to try to act as part of the group and not just take it as just another form of soloing, however I know it at times becomes hectic and things are overlooked. Just try not to get ahead your group all the time.
Couple Notes of Common Courtesy 2012
