This is HILARIOUS! Obviously many people have never played vanilla. If an assassin's blade drops in SFK do you expect someone to equip it? What about Krol Blade, Warden Staff, or any other BOE epics. What if Orb of deception drops or a blazing emblem, both BoE blues worth a tremendous amount of gold! Sure someone might need it to actually use it but the value of items like this are too high considering the actual value of gold in vanilla. The reason everyone rolls need on items like this is so everyone has an equal chance at getting it which is how it should be with BoE items of actual value. If I rolled greed on a item that could sell for say 50g and one or two other people needed it I would feel cheated. That's half the cost of lvl 40 riding + mount!
I personally greed some BoE items if someone says they are going to actually use it. The ONLY ways to ninja in a party are to swap to ML before a fight and leave with all the loot, Need on BoP items you can not use or have VERY little value for your class and spec when it is obviously meant to go to someone else (example would be a hunter rolling on elemental shaman mail), or if a person says they are going to equip an item to get people to greed and then sells that item. What should be done when something of high value drops like that is someone should say ALL NEED and if someone accidentally greeds you give them the opportunity to /roll so everyone has a chance. Now it does suck to have something awesome drop and it be perfect for you to actually use, but everyone else wants to sell it. This is why some people like me will ask and then greed, but this kind of behavior should not be automatically expected of people and honestly if you expect to take away someone else's chance of selling an item that you will replace one day then you don't even deserve it.