Refusing refunds has costs too. Incremental levels of management get involved and sometimes a lawyer. By that point everybody loses. But that's enough for an i

Refusing refunds has costs too. Incremental levels of management get involved and sometimes a lawyer. By that point everybody loses. But that's enough for an idiot customer. All on top of lost future sales. Buying back their unsaleable junk is quick. Costco tracks customers so it's fairly easy for them to track abuse and find a cut off point.