You do not own your League Of Legends account.

Your league of legends account is not yours to own, that account belongs to Riot, you own nothing on and Riot preserves the right, to revoke access for any or no reason.

Every Skin, RP, w/e, that you have bought on your account, belongs to Riot. Riot is simply giving you permission to use that account/skins on it, should you purchase skins for the account. So please quit whining that Riot owes you any compensation after banning you.