They already went over this on planet Destiny or some other podcast. Newbies would cry about not having enough mats and veterans would abuse it because they have an excess amount of mats. No room for balance and that's not even the best point. Everyone would have the same weapon roll and thus removing the special feeling of having a god roll or something close.
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It just needs to be more expensive. Costing 75 legendary marks + 20 motes or something like that.
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Do you have a link of the video?
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It's one of the last 3 planet Destiny podcasts. I'd shoot one of the guys from the podcast a tweet maybe they know