too many SUPs in ARAM

After extra free-rotation sup champs added, always 2 - 5 SUPs are picked in ARAM. For low level (and who owned few champs) summoners, ARAM has become tiring and boring game mode. It takes long time to quit the game. It's hard to get S and Hextech boxes.

I think 20 free champs and 10 free SUPs are too many to enjoy ARAM.