I loot gear based on three factors -

1. If I have the same class/job as another player, I check their gear. If I have higher gear, I greed. Not cool to need. Just saying. Your progression for anima, squadron, or crafting, does not equal someone's gear progression. If that player has the same lvl or close to mine, I need all day.

2. If another role needs on any gear, and has high gear for the dungeon, I need all day. Eye for an eye.

3. If another role greeds, and has low or high gear, I greed all day.

My own personal looting depends on the reactions of fellow players. I believe helping others before my own. Also, I still have enough seals for days based on my own personal loot rules.