Why not make people earn blue essence by their performance

The higher grade in the game the higher amount of blue essence earned. As it is now the amounts of blue essence you earn is so hardly based on RNG that it almost never gives anything decent. Usually it's just the "minimum" that riot has set to everyone have (A bit over 800 BE for sure if you're over level 30).

So what I'm saying is that people that perform well in the game should get more BE when leveling up. An actual REWARD system.