Does Sai Baba only help spiritually advanced people? Chapter 36 says he delights in the service of those 'liberated in Brahman'.

That's an insightful question, but Chapter 36 clarifies that Sai Baba's grace is not limited to the spiritually advanced. While the text does mention that he "delights in the service of those liberated in Brahman," this highlights his elevated spiritual state rather than an exclusive focus. The same chapter provides a more inclusive perspective, explicitly stating that he "calls out to the poor and weak, fulfilling the desires of all." It also mentions his power to "turn a beggar into a king in a moment." This demonstrates that his compassion and assistance are extended to everyone, regardless of their spiritual or worldly status, from the most liberated souls to the most needy individuals.