Did Sai Baba treat rich and poor devotees differently when requesting Dakshina?

No, Sai Baba made no distinction between the wealthy and the destitute. According to the account in Chapter 14, whether one was a great millionaire or a poor beggar, Sai did not see one as less or more. He would ask for Dakshina from everyone who came for His darshan, regardless of their financial status or background—be they Hindu, Muslim, or Parsi. In fact, to emphasize this point, He would sometimes command a wealthy person to go and beg for the offering from a poor person's house, making it a powerful lesson in equality and humility.