Well I guess we're focusing on two different things.
Because you CAN measure by percentage, but you are choosing not to.
So the question is, who is more generous - The person who donates 50% of what they have (which might be a small amount) or the person who donates 5% of a vast sum and keeps the 95% for themselves?
That's nice and all, but a charity organization doesn't go "Oh goody! 50 cents to fight AIDS!"
Measuring by percentage is disingenuous - it's looking the gift horse in the mouth. Faulting a multi-billionaire because he donates 500 million is petty at best.
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"A conservative government is an organised hypocrisy."--Benjamin Disraeli