As others have pointed, the weapon parts sold will be at a level that will not allow / discourage players to spam buying them to use as faction donation item to level up. An account can hold max 25000 glimmer, this translates into 50 weapon parts at 500 glimmer each. To fully level up a wepon we may need a minimum 15 weapon parts. Plus some infusion here and there which should turn out to be just enough before a player will have to play again to farm glimmer. Just my opinion. I may not be correct.