What is the point of need/greed if people just 'need' everything. Your ability to roll need is locked to your job/class for a particular piece of gear. If the action you are going to take on that gear is not dependent on your need-rolling job/class (such as seal turn-on), you are being greedy and should roll greed.

You would not have the opportunity to roll at all if it were not for your party. Roll greed.