Pork dorks. Craftsters. American Girl fans. Despite their different tastes, these eclectic diehards have a lot in common: they're obsessed about a specific brand, product, or category. They pursue their passions with fervor, and they're extremely knowledgeable about the things they love. They aren't average consumers--they're superconsumers.

Although small in number, superconsumers can have an outsized impact on a company's bottom line. Representing 10% of total consumers, they can drive between 30% to 70% of sales, and they're usually willing to spend considerably more than the average...