What was the main reason Sai Baba asked his followers for Dakshina?

The primary reason Sai Baba asked for Dakshina was not for personal enrichment but as a spiritual teaching tool. The source material from Chapter 14 states that the "essence of this was that under the pretext of Dakshina, Baba was teaching His devotees to choose humility." This is exemplified by his practice of commanding even a great millionaire to go to a poor person's house to ask for Dakshina. This act served to break down the ego and attachment to wealth, reminding devotees that Sai did not differentiate between the wealthy and the destitute, seeing all as equal.