Can you explain the story of the man who didn't want to give Dakshina but ended up feeling restless when Baba didn't ask him for it?

Certainly. Chapter 35 recounts the story of Kaka Mahajani's friend, who visited Shirdi with a strong resolution not to offer Dakshina. He was a man who was averse to idol worship and came with his friend out of curiosity. While his resolve not to bow was broken when he heard Baba speak in his late father's voice, the matter of the Dakshina played out differently. The text explains that Baba asked Kaka Mahajani for Dakshina twice—once in the morning, and again for seventeen rupees in the afternoon. However, Baba completely ignored the friend, asking nothing of him. This act of being overlooked by Baba made the friend, who had originally been determined not to give anything, feel restless in his mind.