Let's see what will happen when we use the highest ranking. We all know that the game has TONS of bots, what will they do? They will rent a really nice deck for just one day then rent a decent deck for sliver or even bronze for everyday rewards. This will results in a drop in the reward card price and hurt us as well.
So, maybe giving rewards base on the latest is not the best move, it's still okay for me.
BTW, I checked the rich list and...I don't think we'll have a say to the game. We can vote but it won't be even close to governance.