Why did Sai Baba show apparent partiality by accepting Dakshina from one visitor from Goa but rejecting it from another?

Chapter 36 recounts an incident where two gentlemen from Goa visited Sai Baba. While they came together, Sai's interaction with them regarding Dakshina was markedly different. He specifically asked for fifteen rupees from one man, which was accepted. However, when the other man offered thirty-five rupees of his own volition, Sai rejected it. The text from this chapter highlights the surprise of the onlookers, noting that Madhavrao (Shama) even questioned Sai about this 'partiality.' The chapter sets up this question but does not provide the answer, leaving the reader to understand that Sai's actions, though appearing strange, are part of his divine play.