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The reason for using a dummy object for event storage in JavaScript is to avoid memory leaks. When listeners are attached to an object, they create a reference to that object in memory that prevents it from being garbage collected. This can lead to a buildup of unused memory over time. By using a dummy object as the storage, the listeners can reference the dummy object instead of the actual object being listened to, and when the actual object is no longer needed, it can be garbage collected without affecting the listeners.