In the story about the 15 rupees Dakshina, what specific investment advice was Baba trying to teach Madhavrao?

The provided excerpts from Chapter 18 do not contain any investment advice Baba intended for Madhavrao (Shama) in the incident involving the 15 rupees Dakshina. The text describes the event as part of the "play of this God." A messenger was sent to collect the Dakshina, but Madhavrao responded by offering "namaskar" instead of the rupees. As Chapter 18 recounts, the messenger acknowledged this, stating "fifteen namaskars were received." The focus seems to be on the surprising nature of Baba's interactions and the forms of devotion, rather than conveying a lesson about financial investments.