Why did Sai Baba instruct Madhavrao to collect Dakshina from Shama in British Pounds instead of Indian Rupees?

The source material does not state that Sai Baba requested Dakshina in British Pounds. In fact, Chapter 18 explicitly mentions that Baba sent a message with Madhavrao to collect "fifteen rupees as Dakshina from Shama." The narrative highlights Madhavrao's surprise at this request and Shama's (the narrator's) initial response to offer 'namaskars' instead of money. The focus of the passage is on the divine play of Baba and his unique ways of interacting with his devotees, not on the specific currency used for the offering.