The cost of materials is (precious) marks whereas before we could trade materials in, which was nice for players who lacked time to play both sides (PvP/PvE).
Spending marks is not worth saving time to hunt them up when there is a cap on how many marks a player can earn in a week -.-
In my opinion, Using Glimmer would be a much better and more feasible currency option.
Raise the cap or change the means ;)
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I tend to have a problem not keeping a hold of large amounts of glimmer.. Which is only going to get worse with the 'upgrade' plan they're implimenting... Seeing as weapons, armours etc need Commendations I really want them to raise the weekly Marks cap