I'll start by saying for the most, part I believe your statements are noble and have good intentions. It can be frustrating to get items that you don't need and yet players are still looking for them. I picked up lucky raspberry on my titan the first week I started from a random drop and broke it down. So trading items only MIGHT be ok at first. I would foresee the currency being shards/relics but that's just my prediction. Then you would still have those "farmers". These farmers would collect mass amounts of popular gear and sell them for real cash. If this is how a person wants to play the game then by all means go for it. I could understand buying a DLC and getting new items and content, but buys that item you want just cause you don't feel like working for it is kind of sad. Nevertheless, this will still occur through trade. Last, even though everyone has the same chance at drops if they are close enough to the mobs, I feel as though bots will be developed and swarm the servers. They will most likely sit in one location and rack up kills until they run out of ammo. Then rinse and repeat. How is this different from a cave farmer you ask? A bit could farm for days non-stop and break down everything they do not need while a gamer will probably get bored after a few hours. Your reasons for developing a trade system are legit and noble, however, this system puts too much of a risk on the game itself. Do you really want to obtain that extremely rare piece of armor and then see some store bought scrub with it the next day? The amount of work for the developers to implement a trade system and deter these problems would take a very long time and would be very expensive. Risk > Profit