There are enough possiblities to spend even unlimited amounts of bread. It can help to boost your ingame progress and help you to earn more on our profit share. You could also earn by selling your heroes and items to other players. With more bread you could potentially get more (better) items.
We want active players to promote the game. If you are an active player you will be able to convert those breads into more STEEM in the end.

Using the ref link will only benefit those who are actively participating in the game itself.