It's entirely fair to roll Need for items you intend to use, regardless if the use is seals, glamour, retainers, or personal upgrades. The only thing that would make you a dick imo is rolling Need solely for the sake of other people not getting the item, and as there's no way to tell WHY someone is rolling Need, that's entirely between you and your conscience.
Of course the caveat with that is don't get upset when other people roll Need in their stuff too. Fair is fair, after all.
