One day while playing destiny I opened my vault to find that I had over 800 of each material I was pleased when I found through research I could exchange these materials for marks but of course that feature had been removed when I went to sell my materials, I can see how A material exchange for marks could create a problem but only if it is poorly sought through. Just give me something to do with my materials other than throw them away, I grind on destiny for such a long time and still have only found about five weapons to use these materials on. I am very frustrated with the upgrade material set up.