Legendary Shards, I personally have over one thousand and I know friends that are pushing three times that Xur under prices exotics and you don't spend anything for infusing so there is no reason to bring that up. I fell like the only way that we can make use of our legendary shards is to allow us to buy more things with them. Some examples that I have seen are to re roll weapon and armor perks, to be able to buy mod components and to sell them for glimmer. These are a few suggestions and I feel the Bungie team could find more and even better ideas.
-Emptation
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Should be used to single out a weapon you want but at high cost.