Why not add the Skin Boost button from ARAM to all games? I enjoy playing random skins.
More money for you Riot, and shouldn't really affect the game. It might even put people in a good mood before the game like "Hey this guy spent some money so I can play in a skin, I think i'll be really nice this game." I just think it's a cool feature that isn't USED AS MUCH anymore since there aren't any reward incentives besides IP anymore... but would be nice from time to time.