Should be able to buy levels
There are two things people hate: Smurfs in low level games, and leveling up a second account
If Riot made it possible for people to just buy their levels, for say 100 RP per level, a lot of smurfs would not be in low level games making the new player experience more enjoyable and Riot would make more money.
I don't think that any new players would pay to level up their accounts and if they did they would just end up in bronze V where they could learn with everyone else.
Let me know what you think of the idea.