Based on the provided text, why did Shirdi become such a significant place of pilgrimage?

As detailed in Chapter 22, Shirdi became an extremely sacred place primarily because of Sai Baba's divine presence. The text states that in Shirdi, Baba manifested as a "Wish-Fulfilling Tree (Kalpavriksha)," accessible to all. He was known to look upon the poor and the wealthy as equals, showing no distinction. People flocked to him because he would show "some incomprehensible miracle" to achieve the welfare of the devotee. It was this combination of his manifest presence, his principle of equality, and his powerful, benevolent actions that transformed Shirdi into a holy place where pilgrimages flowed day and night.