When rolling Need on an item

[Giantbane]

It's probably made so the client is determining if you can click need or not. So the server has no idea who can or can't need on it. It just handles the rolls and the distribution. Would make it easier on the server.

To elaborate, anywhere that you can trim communication on a server, you do. So if the server doesn't have to transmit to the client to grey out the need button, then it won't have that information. As far as the server knows, it waits for X amount of rolls to be completed then rewards the highest roll the item. So in this case they would trade some server bandwidth for a slight inconvenience on someone not rolling for an item. While I would agree that it is a miniscule amount of data to transmit from our point of view, imagine for all the loot rolls. That's a lot of rolls a minute (probably in the neighborhood of several thousand or hundred thousand a minute.) Tons of data that is saved.

I doubt it, it's an MMO, you should trust the client with as little as possible (because the client can be hacked). I doubt either the decision to need/greed or the roll is client authoritative for this reason.