you know this is in every MMoRPG ( and since PokeMMo wants to be an MMo), this does work, I think it should be in the game, but the "scams" people are saying it happens you could A get over it ( been in guilds etc that happened to them and they just keeped on going replaced the money rare items etc) or B The staff could add it correctly, permissions etc or even how many items you can take out from the ranks in the team. Like Grunt 0 Member 1 Officer 5 etc etc
And a log that tracks everyone putting and taking stuff out that everyone can see
you will have leaders that will scam but they will be weeded out once they do it, because they need to run an rich team to be scammable