Mercari is essentially eBay with a better UI and a younger soul. It’s the primary hub for the 'resale' culture that defines how many Gen Z and Gen Alpha kids think about their stuff. It’s not a game, but for a kid with a collection, it can feel like one.

As long as you are the one holding the keys to the account and the bank link, it’s a fantastic tool for teaching them that their stuff has value and that 'new' isn't always better. Just keep an eye on the DMs and help them navigate the inevitable lowball offers and 'is this still available' ghosts.