Loot System

So it seems the loot system has changed from skins to a very high percent chance of receiving champions. Why even have this system then, just annoys me everytime. So I try hard help my team achieve victory and I am rewarded with a loot box, only to get a new champion. Great! only down side is I own all the champions..... so it is basically useless. I assume Rito was probably losing money because people stopped purchasing skins in trade for chance at loot? Why not change the algorithm a little for players with all the champions?