Can you explain the perplexing financial interaction Sai Baba had with the two visitors from Goa, and why it was considered surprising?

The incident involving the two gentlemen from Goa, as detailed in Chapter 36, was surprising due to Sai Baba's seemingly preferential treatment. Both men came together for his darshan, yet Baba requested and accepted a specific dakshina of fifteen rupees from one, while flatly rejecting a larger, voluntary offering of thirty-five rupees from the other. This act was perceived as partiality by the onlookers. The surprise stemmed from the rejection of a larger, freely given sum in favor of a smaller, requested one, which contradicted conventional expectations and prompted Madhavrao to question Baba's mysterious ways.