With over 94 million Costco members worldwide, chances are you know a Costco addict. There are Instagram accounts devoted to Costco, like @costcodeals, and websites, like CostcoInsider.com. Costco has even become a travel destination and - for one couple - a place to get married. Buying in bulk isn't for everyone, but Costco members love the wholesale club because it makes you feel like you're getting a good deal.

"Some of their customer base is absolutely addicted to Costco — absolutely addicted to the experience and the brands and the thrill of going to Costco," Patricia Hong, partner at the global management consulting firm A.T. Kearney, tells CNBC Make It. That's by design — inspiring obsession is all part of Costco's playbook. Here's how Costco gets you hooked.

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Why You Spend So Much Money At Costco — Hooked