Due to the high number of repeat units we receive, I think it would be a great feature if the game had a unit exchange where players could go to swap units. The unit you don't want because you already have enough of them might be a unit that another player would love to have and vice versa. It could be a site-wide exchange or alliance specific so that only members of an alliance could exchange units with other members of their alliance. They already give us the option to sell units, so why not give us the option to swap units or even to buy them from each other?
