There's something "Lord of the Flies"-esque about the way that Blizzard drops loot and then allows players to decide who gets it. DKP, Loot Council, Biggest Upgrade, Two Token, simple rolls. Every system is flawed. Someone is going to walk away unhappy. For GMs/RLs I give you this advice: be fair, be consistent, and brace yourselves. Odds are good, someone is going to be unhappy and you're going to have to deal with it.
But this column isn't for GMs/RLs. Jealousy, the green eyed monster is one of the worst adversaries in WoW. Guilds have fallen apart over loot decisions and overall loot practices. In most cases leadership tries to be fair- with an eye on progression. A good GM doesn't play favorites when it comes to loot. With good leadership, you can count on decisions that strengthen the team as a whole.