I always thought standard procedure was NEED EVERYTHING YOU CAN, GREED AND PRAY FOR EVERYTHING ELSE kinda thing... from my experience at least. I don't really expect people who can roll need but won't equip the dungeon gear, to greed or even pass on it out of the kindness on their hearts... especially when there's just so many things you need GC seals for these days. Nope.
EDIT: If someone specifically asks everyone else to pass loot for an alt they're trying to gear up though, sure I'll pass(albeit begrudgingly, to be quite honest)