For example: The ~$400M donation to Susan Thompson Buffett Foundation give out about 200 scholarships per year at a max of $10k per scholarship ($2M/yr total). At a 10% rate of return (BRK actually does way higher) the foundation earns $40M/yr. So only a tiny fraction of gains are given out. Since the scholarships are $10K max per scholarship the average payout per year is probably way lower than $2M/yr. So really, what is the purpose of this foundation?