I Do Not EARN KEYS AT ALL,

Well I play alot, and I get an S on my fav champ every 2 game, lets say. Can you not get keys from playing same champ? Or do i have to keep learning other champs inorder to unlock my level 6, which I fully should have... with the 17 S ranks ive gotten within the time period the level 6 and 7 champ came out, I do believe that you should get x amount of s ranks not pay blue essence. blue essence should be for champs... But what ever. I have exactly 325788k on dont you think I should get level 6 or even 7 and not have to pay blue essence... its kinda faulty like the afk ban i just received, didnt afk "league crashed!"