Since we need an extreme stockpile of all crafting mats to upgrade gear and everyone hates the mindnumbing experience of running in circles to get them, why not makethem available for purchase in the tower? We cane exchange them for vanguard or crucible marks, so why not the other way around? This would encourage players earning marks by doing missions and crucible matches instead of doing doughnuts on a sparrow. Personally, I would even be willing to pay DOUBLE the exchange rate for marks, 10 marks for 50 spinmetal is fine by me. I just enjoy killing things a lot more than iding around a la Nascar (and yes, i am a titan). Let me level up my gear by killing bosses and punching hordes into submission. Anyone have/see a problem with this?