Why should one invest Motes of Light or Strange Coins if you can have it for Glimmer from the Gunsmith?
What am I missing here?
Edit: People, this post is old and pre DLC, where Glimmer was always a resource you had plenty of while just gaming but I bought a lot at Xûr back then and had less Strange Coins. Nowadays it's the other way round!
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Because there's only a few exotics I don't have - HotPF, Hard Light, and Skull of Dire Ahamkara - and even if xur sold them all at once I would still have around 50 strange coins, and nothing else to spend them on except for heavy synth. Plus, I would much rather save my ever-shrinking pile of glimmer for upgrading weapons.