Because the other 4 are more common for upgrading . Wormspore is only for raid weapons and armor? And some exotics. But there so easy to get with the ghost and CoO that there should be something done like trade for rep. There's even more grinding which bungie loves
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I don't see how the others are more common. In fact, you just said that wormspore is easy to get, so how are the materials that are harder to get more common?
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Sorry my stupid logic I mean more common for upgrading