since we get limited amount of refunds which is given once (3 or something returns when u can refund champion you bought with ip)
and it sucks since u cant sell champs which u dont even like playing and dont want to have them, so suggestion is:
give unlimited refunds but payback only sertain amount IP of original price, so lets say:
you bought llIaoli and you regret that you bough her, so you can refund it with paying "tax" for it lets say original price is: 6300 IP
refund costs: 30% of original price and you get only 4410 IP back, tax system is just so people wouldnt buy champ for 1 ranked game or to avoid boosters abuse by buying champ and then selling it after boosting is done tho. cya.