why is there a ranking system in a game thats entirely decided by luck?

ALSO FUCK PEOPLE WHO CHASE MY DEALER RIICHI THREE SIDED WITH SINGLE TILE SHIT WAIT AND MAKE ME DEAL INTO THEM IPPATSU STYLE FOR A RIICHI ONLY HAND FUCK THE GOLD ROOM ESPECIALLY BECAUSE YOU FUCKERS ONLY CHI+PON ALL THE TIME AND NEVER PLAY SAVE TAKING AWAY ALL MY HANEMANS AND BAIMANS FOR YOUR MEASILY 1 HAN HAND

ALSO FUCK PEOPLE WHO DAMATEN ONLY YOU PEOPLE ARE COWARDS AND IF I WAS PLAYING ON A REAL TABLE WITH YOU I WOULD BE SLAPPING YOUR ASS UNLESS YOU ARE GOING SINGLE TILE WAIT ON THE 5 ALWAYS CALL YOUR FUCKING RIICHI YOU DISGUSTING SLOB