Although Costco is the third-largest retailer in the world, it actually makes most of its profit from membership fees.
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- Costco says it's rolling out member ID scanners to local warehouses "over the coming months."
- The wholesale club previously tested the tech at select locations earlier this year.
- The move extends Costco's Netflix-style crackdown on unauthorized membership sharing.
It's official: Costco ID scanners are here to stay...