Trading cards might sound like child games - but some are worth more than a house. One Pokémon card sold for nearly nine million dollars. And where there's money, there's crime. Just over a week ago, a shopkeeper was stabbed during a trading card theft in Newmarket. So what makes a bit of cardboard so valuable? Long-time collector and co-founder of The Pokémon Clan, Peter Johnson speaks to Susana Lei'ataua.
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