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They are planing to remove them(vouchers)from the list, they made it clear it was a one time thing, and these items are rare if not unique. They were one time use. Am I surprised its not done...

Vouchers were a one time thing, a promotion for the crafting building.
You would rather do daily trails for one peice of material? when they allow us to lvl the building and give us higher end...

There's nothing wrong with crafting.
But the way the materials are collected, now that was a bad idea.(way too slow to be of use)
Questing for materials has to be the slowest way to gain mats...