In my experience we only 'all roll for shards' if we have opted to give unneeded items to the enchanter in the first place. :)

If I were to make a group and the enchanter wanted to keep all the shards, I would permit all unneeded items to be greed/need rolled by all.

My 2c!

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Q u o t e:
what bout herbs and stuff then we can all use those 2 don't we

to the dwarf : If you in my group i step on you
luckely no ugly dwarfs can join my group ^^

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How I see it is that a Herbalist is the only person that can loot the herbs.

I understand a (dis)Enchanter is the only person who can take shards from an unwanted item, so if they wish to keep all shards, then they must roll on the unwanted item like everyone else. Other people can loot the unwanted items, and vendor/use them as they wish.

This is how it works on the realm I play on, or at least in the groups I run. :) It seems the fairest way I could think of when forming groups and sorting out a loot rule. I am always open to suggestions also!