So, I had a thought about this. Since the removal of the material for marks exchange wasn't mentioned in any notes prior to the DLC and since they did institute a new exchange of marks for materials, what if they didn't intend for the material for marks to be removed? I haven't read anywhere about anyone at Bungie/Activision even acknowledging that the original exchange system was removed. Kind of like how we lose ammo when we die or go to orbit or how heavy ammo on the ground disappears when a rocket is fired in the area. They only just recently acknowledged the heavy ammo issue. What if in the process of instituting the new exchange system some code was overwritten or screwed up? Just a thought.
[b]EDIT: I have no idea why people are commenting on this again. This is a very old post that was last edited (before this edit) Feb. of 2015.[/b]
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If some code was overwritten they would be able to roll back to the last committed files in what ever version control system they use; perforce, tortoise SVN, or some in house built one. So as nice as it would be to be just a mistake... that would be an easy fix and should never have made it out of QA.