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Passion for the product and the willingness to learn about the business and manufacturing process have been key factors in the success of the speaker's business. By being involved in the production and having a deep understanding of the product, the speaker is able to make informed decisions to improve the quality and design of the merchandise. This hands-on approach has also contributed to the rapid sales growth, with 6,000 hoodies sold in less than 36 hours, without the need for extensive promotion on YouTube.