[invaliddata]

I know about one well known tech executive who donates about half his income every year, and increases that percentage by 1% each year (he's been doing this for a few decades, since before he "made it.") Granted, not everyone is in the position to do this, but the point is that there are people who have managed to keep a serious long term commitment to philanthropy, but whose efforts are (probably intentionally), not so well known.