Hey Bungie,
Since the micro transactions have been introduced I'm yet to see anyone mention anything about Tess selling any new shaders, ghost shells, class items ect. Also I think there should be themed sparrows and ghost shells with active cosmetics like the taken ghost shell for example. I'd definitely buy a sparrow with active blue flames or shaders with glowing effects with matching class items.
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Something useful, like top tier weapons and armor, and a heavy Pike.