Idea for client Store

I wonder how sales would turn out (champions in this case) if there was an option to pay 60% the price in RP for a champion and then the rest would cost 50% the champion in IP relative with the original price. For instance Jayce costs 880Rp & 4800 Ip, if you want the champion then you would have to pay 528rp and 2400 IP. Thats basically the idea obviously math could be modified to suit Riot purposes but i think it can work. *I apologize if this is in wrong board please move if it is