I would have liked if they turned the stars you earn from playing into currency. At the end of the song, just put it all in some pot that you can use to buy things. I wouldn't even just limit it to clothing customization. Have new attitudes, faces, hairstyles, videos, game modes etc unlockable by cashing in on your game time. Playing in a band earns you 4 times the stars so there'd be an incentive to play more online or local multiplayer.I'm really pretty surprised there isn't a cash shop for clothes and gear.