The only excuse for enhancement cores to be unsustainable is because they're used in master working weapons, everyone gets why making a rare currency lock infusion is bad but no one brings up the fact that people who don't play the game religiously enough to have a stable income of cores will never masterwork a weapon in their life because they're losing them all in infusion. The current system is simply a no win scenario for the average player, not only are their exotics and preferred weapon types being held hostage come time to do high power content but their beloved weapons will never be masterworks either, so cut this bullshit already and make a separate more common currency for infusion. We can increase the rate at which players can infuse and stop -blam!-ing over the masterwork system, simple. [spoiler]Or we could just use legendary shards and glimmer alone like in taken king but Bungie are obscenely against that for some ridiculous reason.[/spoiler]