Because farming gives you the same amount, if not, more loot then you would in a strike or whatever. Why go through the trouble of constantly dying, leaving teammates, and bullet sponge bosses when you have an easier time getting 5 times the rewards farming the cave.
Don't deny it, YOU KNOW ITS TRUE!!!
English
#Destiny
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Bungie wants us to farm or else they wouldn't put caps on every other God damn way to get resources. Marks? Oh only 100 a week. Nightfall/weekly strikes? Yeah you only get rewarded once a week