What was Baba's financial advice behind demanding exactly fifteen rupees from Shama?

The episode of the fifteen rupees appears to be less about financial advice and more of a spiritual play or 'lila.' As recounted in Chapter 18, Baba sent a messenger to get fifteen rupees as Dakshina from Shama. However, upon hearing the request, Shama responded by offering fifteen 'namaskars' (respectful greetings) instead of money. The messenger accepted this, saying, "fifteen namaskars were received." Baba did not insist on the monetary payment. Instead, the interaction served as a pretext to have Shama come and talk, suggesting the motive was about fostering connection and imparting a lesson through a surprising act, rather than a literal financial transaction.