Why is Gaya considered better than other tirthas for Pind Daan?

The Vayu Purana explicitly states that a single Pind Daan at Gaya equals Pind Daan performed at a thousand other tirthas. This extraordinary merit is attributed to the presence of Lord Vishnu’s sacred footprint at Vishnupad Temple, the story of Gayasur whose consecrated body became the sacred earth of Gaya, and the scriptural tradition that connects Gaya to the liberation of souls going back to the time of Lord Rama. Gaya is also one of the few tirthas where liberation is available throughout the year, not only during special festivals.