For excange items between players in ally we need bank. Anyone can get here anything and GM give items to members from bank.
And market for trading items. (Not heroes)
Простите, английский у меня совсем плох 
This wouldn’t be a bad idea but I’d say hero’s would be put in too. Everyone could use different hero’s from time to time.
This topic is currently already being discussed here:
Please join in the discussion! 
I am closing this thread as a duplicate.