Idea to reduce smurfs
I wonder:
Would it be smart to have a "prestige" system similar to CoD? Since people like to get new accounts to run through lower levels, have it setup so a player is able to keep their mmr and other things bought with that account, but they're locked by level. (Say a lv 30 resets back to 1. He can't use his full rune or mastery pages, but he is able to use the champs he unlocked with the skins bought/gifted to them). Because they keep their record, they'll still be matched against higher level players, and avoid being matched against new players with their new accounts.