Guilds are great except for when people argue with one another.
The most common argument I see in MMORPGs is fighting over item drops. Rogue gets some scepter of power that they can't use and other people assume that they should have to hand it over to someone in their party that can even if the Rogue won the "roll".
It's a dicey thing - rare drops. That rare drop might be worth 30 gold to the rogue. Do they hand it over to some mage they're traveling with simply because he's there?
As the guild master, I seem to spend a good deal of my time dealing with disputes on these kinds of things. I just want to play the damn game. People need to take a few steps back and remember that it's supposed to be fun. They should try to be honorable but they should also not be so sensitive to perceived wrongs done to them.