because it already does and its better then getting the same crap Legendary pulse rifle 5 times in a row....and it helps if you need coins for Xûr.
English
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Strange coins are the primary reward in addition to rep and marks for completing the Weekly. Anything else is "extra". I honestly wish that Strange coins were not in the Nightfall loot table. It should just be gear related - whether it's an exotic or a legendary
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I kinda like having them there due to the fact I don't have the DLC any more so I kinda can't do the weakly heroic.