Trading caps, limits and obstruction literally prohibit party share of resources and drops. If you and your friends are in a party, hunting for collection items in the less than 1% drop rate, have fun grinding up the same item over and over again.
You thought you needed only 5 items if you are in a 5 man party? Guess again bud. In Tree vs Bots the game) you need to grind those pesky 0.X% drops a hundred times over and over again, because the wrong person looted it and (s)he cant give it to you.
I experienced this first hand when i went out with 2 of my friends and had ground up 7 drops instead of 3 because one person got 4 and i got 2 before the last one of us finally found a single piece.
TL;DR:
1.) Instead of only weapons and recipes having a colour code based on their rarity. All drops should have it based on their drop chance. If an item is a 0.XY% drop
(This in itself is a needed informative feature, because with all the trash drops the game has, you will never know that the stone dust that just evaporated from one of the mobs is actually a rare drop which is worth hundreds of thousands. And you just sold it to an npc for 10 silver. Have fun.)
2.) Need/Greed feature should be implemented based on stated above rarity factors/colors, allowing party members to roll on them and share.
P.S.:
No, i dont care about how or why (if at all) a botter can abuse this feature. Install hackshield on your game or whatever. I have had it with me, my friends and the entire playerbase having to suffer because you are having fun battling botters and burning down the game around you in the process, capping, restricting, locking away every basic feature the game should have.
I simply dont care.
If you cant find a solution to the issue which punishes the guilty more than it does the innocent, dont try to solve it in the first place.