so i cant benefit from sharing on account?

I just Google it. And the first one said no, that you have to earn every item on every character

I heard you can share items in your Warband camp chest. As I haven't managed to get my Warband camp up yet, I can't verify how exactly this works. I think it's loaned out possibly so I assume the question is: Can you sell items off-game? That would be no. There will probably be some ways to trade, though. People will or have figured it out by now.

U can borrow from ur buddies