"Is it fair to say the wealthy are less generous when they are donating more money by one metric but not another?" In my opinion yes, simply because I feel the

"Is it fair to say the wealthy are less generous when they are donating more money by one metric but not another?" In my opinion yes, simply because I feel the "raw $$$ given away" metric is inherently useless when attempting to measure generosity; Exactly because it doesn't factor income into the equation. Someone making $1 million annually could give 100% (or more) of a lower income individual's income away without any serious effect on his quality of life.