Me and a few friends were discussing this, we are all 20+ with close to 20k in glimmer because there's nothing to buy! All the legendary gear from vendors costs alternate currency (motes of light, coins, etc.) I don't need another ship, or a shader, and the weaponsmith/Cryptarch sells junk. I think it would be a good idea to be able to buy materials. Spend glimmer to get a strange coin, or weapon parts, or Spinmetal. Or start having the vendors sell worthwhile stuff daily.