Why was Sai Baba so angry at Damu Anna for wanting to get into a business deal? It seems like a huge overreaction to just wanting to make some money.

The provided text does not explicitly state that Sai Baba was angry. When Shama brought the letter from Damu Anna, Baba's initial comments were insightful, noting that the man was "trying to touch the sky!" After hearing the letter, Baba's response was more of a cautionary counsel. As detailed in Chapter 25, he stated, "The Shet's mind has gone astray!" and advised in reply, "what do you lack at home? Half a loaf of bread is enough for us; do not fall into the trap of millions." This suggests his reaction was one of concern and guidance against excessive desire, rather than pure anger. Damu Anna was the one who felt crestfallen, as if he had "kicked away the served plate" himself.