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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It's like if some one said you can get a $1,000,000 from either running 100ft or by climbing mt Everest. No one would pick the latter.