Whenever I see some node that is not from my tier anymore, I just rather to pass by and save my inventory space, because people simply dont need them if not for grinding their crafting skill, so selling it feels like so. Also, there is no much incentive to repair your equipment as the repairing prices are stratospherical. So, why not to implement the use of refined materials so we can repair our materials? Nothing sounds more verosimilar than a master crafter being independent to care for his own epic gear crafted all by himself, right?