Selling Pokémon cards and other collectibles made this 25-year-old $345,000 in annual revenue. Here's how to start investing in trading cards. || An entrepreneur who made $345,000 in annual revenue selling collectibles like Pokémon cards gave Insider his tips for investing in trading cards. https://www.businessinsider.com/how-to-make-money-investing-trading-pokemon-collectible-cards-2022-6