What was the strange message about fifteen rupees Dakshina that Baba sent with Madhavrao?

Chapter 18 narrates a peculiar incident involving a message about Dakshina. Sai Baba sent Madhavrao to the narrator with a very specific and unusual instruction. Madhavrao reported that Baba had suddenly remembered the narrator and told Madhavrao to go to him and 'Take fifteen rupees as Dakshina from Shama.' This message greatly surprised the narrator (who is identified as Shama/Madhavrao Deshpande). Instead of providing the fifteen rupees in cash, the narrator humorously replied to tell Baba that 'namaskar' (respectful greetings) was his form of Dakshina. Madhavrao then noted that fifteen namaskars were received. Baba had also instructed Madhavrao to sit and converse with the narrator for a while, suggesting the encounter had a deeper purpose than just a financial transaction.