Brilliant!! We did this with our gullible, greedy 4-year old granddaughter who was lusting over the current thing and you could see the wonder and lust for the toy drain from her little face and be replaced by an old soul's cynicism. And you're correct; it became a game from that moment on. "Marketing," she'd say, looking bored, and then she would do something else. She has become a discerning, intelligent young adult who, as far as I know, has fallen for nothing. She has outwitted her university and never received the vaccine despite taking in-person classes and playing on a varsity sports team. Of course, she is a conservative. That early eye-opening lesson has served her well. It has become the stuff of legends in our home, as well.