My working class family members always gave 10% to charity (kind of the standard social contract in the US for giving) when that 10% made up a huge percentage of the money it takes for them to live a very basic life. Compare that to billionaires who have more money than they could ever spend and the percentage they have given:

Zuckerberg 2.1%. Ballmer 3.7% Bezos 1.6% Sergey Brin 2.5% Michael Dell 2.6% Ken Griffin 5%

https://www.forbes.com/sites/forbeswealthteam/2025/02/03/ame...