i see two solutions to this.
the more broad approach, enable trading when both the trader and tradee are level 30.
a more neutral approach, make it possible to swap/donate received items at the ends of strike/raid
thus you dont get situations where two people who already have a particular piece of raid armor complete a raid together and get duplicates to what they already have, instead of what they need/want, and since its only endgame strike/raid items it benefits people who play cooperatively rather than encouraging the sale of items outside of the game.
Contrary to Bungies beliefs, grinding the same strike/raid over and over to try and get a full set of something, isn't really fun.
Also on the topic, requiring glimmer to upgrade items is stupid, they should just increase the resource needed (spinmetal, etc) and then upgrade the NPC's to allow you to upgrade AT npc's using less resource items and money instead, since it would actually contextually make sense at an NPC - where exactly does the glimmer go if you upgrade your items in the field?
