As a resto shamman my thinking is this:
Said piece of gear is made for us, plain and simple. We don't have to reforge it, we don't have to spec into anything, we don't have to do anything special, its just for us.
Ele shammies however have to spec into a certain talent (Elemental Precision) to even have a leg to stand on when rolling on loot for healers. Because you have to spec into something and we don't, you should give the healer the loot. If you put those 3 points elsewhere you wouldn't get to roll on our gear.