Why did Sai Baba demand fifteen rupees Dakshina from Shama as a penalty for someone interrupting the reading of the Nath Bhagawat?

The source material presents two separate events that are not causally related. Chapter 18 describes how the author interrupted his own reading of the Bhagavat, and Baba, valuing the text, insisted he go back and finish it. No penalty was involved. Separately, the text mentions that Baba sent Madhavrao with a message to collect fifteen rupees as Dakshina from Shama. The narrative does not connect this request for Dakshina to the interrupted reading or suggest it was a penalty. They are distinct occurrences in the day's events as described in the chapter.