Well, I am not convinced at all that the% is a discount for the purchase of Bread, but I understand that what they want is to encourage players to buy within the system.
I admit that I would have liked more% of "Breadcrumbs" of each player that comes to the game for my reference, that would be more attractive to me and if I did not misunderstand the dynamics of the game, the generated Steem depended on the crumbs collected in the missions and in the P2P fights of the Arena (if I am wrong, please someone to correct me).