Renting Champs

We all have experienced buyers regret after buying an expensive champion. While Riot has used refunds to help solve this problem there are clearly limitations to this. I have come up with a solution.

Champion Rental

Players should be allowed to rent a champion for RP for a duration of games to see if they like the champ. Then after whatever number of games has expired they would have an option to either buy the champ for its original RP cost minus whatever it was rented for, or just let it expire and not have that champ available to them anymore.

Thoughts?