Here's The Most Common Reason Costco Revokes Memberships - Tasting Table
Briefly

Costco holds the authority to revoke memberships without offering an explanation, primarily targeting those who abuse its generous return policy. Customers are encouraged to return unsatisfactory products but doing so excessively can lead to membership termination. Frequent returns of electronics within the 90-day window or other items after heavy usage may be viewed as egregious abuses. Additionally, a member's respectful behavior is paramount; rude behavior towards staff or fellow shoppers can also warrant revocation. Therefore, maintaining proper etiquette and adhering to policies is essential to avoid losing one's Costco membership.
Costco can revoke memberships without explanation, typically due to abusing the return policy or exhibiting rude behavior toward staff and customers.
Frequent, excessive returns, especially of electronics or seasonal items used beyond their intended purpose, can lead to immediate membership cancellation.
Costco's generous return policy does not allow members to exploit it; egregious cases of abuse can involve terminating a membership without notice.
Maintaining respect towards employees and shoppers is critical; impolite actions can result in membership revocation, underscoring the importance of good etiquette.
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