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.
 
										 
					 
		    