Don't Even Think About Breaking These Costco Membership Rules - Tasting Table
Briefly

Costco requires members to abide by certain rules, including treating staff and customers decently. Problem customers may have their memberships revoked, making it harder to rejoin.
Receipt checks are part of the Costco shopping experience. While it may feel tedious, they serve to prevent shoplifting and ensure the integrity of Costco's operations.
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