WT certificates.

[Culfinrandir]

The point is to be able to choose what gear you want if the weekly one aren't what you wanted.

Exactly, it was getting to the stage where people could potentially win the same "OMG über rare Augmented" stuff multiple times. Or, in my case, keep getting gear for jobs they haven't levelled whilst praying for the gear from the week before or after. This way you take your voucher to the NPC & get exactly the gear item you need. It was a very sensible change.