Enchantment cores aren't really in a true economy though. The people that used the exploit and now have 10k cores, haven't actually impacted you. Now if there were only a limited amount and them having thousands, meant there were none available for the rest of us, that would represent a broken economy. Or if Destiny had an auction house and cores could be traded for, that would be a broken economy. But them having tons, doesn't negatively impact anyone else's ability to acquire them, so it isn't really an economic issue. And master working armor doesn't make you super more powerful. At least not game breaking. So it really just pisses people off because they got something easier than it is to grind out the still available materials.