Player-crafted items (armor, weapons, etc.) - Sell or Salvage?

Trying to make some MP armor pieces, but I generate a ton of "failed" items before I get the MP one. What should I do with these failed items? Til now I've just sold them back (at whatever loss is the norm). Is this the best strategy to minimize cost? Or does it make sense to salvage and re-use components? Trinket and vendor?

Thanks!