Instead of selling those unobtainable items on the cash shop...they could have been prizes for mini games in the gold saucer. Things in the cash shop should have been hairstyles, tattoos, face paints, and the introduction of character accessories (back packs, bandannas, other body piercings, even capes!) If there is anything i learned from the sims is that people would happily spend a large amount of money on vanity items and no one would be upset because none of this has any impact on the game and can't even be held under scrutiny of "withheld content".