I think you're diluting the term "loot ninja". To me, "ninja" looters are those who abuse the position of group leader to get stuff without rolling on them at all. That's very deserving of public shaming, and a known ninja looter should never be given the lead role.
People rolling on bind-on-acquire items that their class can't use are indeed a problem, but not nearly in the same class as master-loot-abusers. Public shaming works here too, and smart group leaders can nullify this issue entirely by using master looter rules and making sure the roll winners can actually use the items.
People rolling on non-binding items aren't a problem for me. If you have a use for it, on that character or on an alt, rolling "need" is perfectly acceptable. If you win it and I really need it, I'll ask if you would be willing to give or sell it to me, and I'll live if you decline.
Whatever it is, it will drop again, and life's too short to worry about someone else's reasons for clicking "need" or "greed".
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