When comparing how much people give for charity, percentage is all that matters. If someone makes $50k/yr and gives $5k/yr to charity, and someone else makes $5,000,000/yr and gives $20k to charity, do you really consider them to be more generous since they gave FOUR TIMES the amount? No, they are less generous. They would be giving 0.4% of their salary vs. 10.0%. The impact on their lives would be non-existent. The point of charitable giving is that you are giving up something for other people -- you are saying "my life will be harder so that other people's lives can be easier."
But yeah, I guess you could say they gave quadruple the amount to charity, if you wanted to be disingenuous.