Champion Selling
This is an idea for riot to be able to sell no more wanted and no more played champion with they're skin.
Tired to see THAT champion that got nerfed to death and is now useless in your champion select? 
It an idea that Riot make a value of RP in IP and we could be able to sell IP/RP bought champion for 1/4 or 1/2 the price instead of 3 item for it whole value refunded in IP.
I think this is reasonable and wont break Riot profit because 1/4 of price in IP is not a huge gain for player. (mostly level 30 with they're rune page have like 12k IP unused)
It only affect champion and skin of course. Rune, ward skin, avatar and even bundle buyed champ and skin.
Or if it can destroy Riot's money gaining it can also be a kind of trading day where each week different champ can be bought by trading other champ or skin for 1/2 they're value.
And finaly sorry for the any grammar mistake english is not my main langage. Grammar nazi i
you :P