I think most rich folks would pay more if they knew everyone who was rich was also doing so.
there is a parity issue at play... and if you're going to donate there are more efficient ways to do so than giving it to the government (i.e. create three jobs by starting a cafe, invest in startups, etc).
what bothers me is that giving any money to the gov-t is the least efficient way, because the gov-t is not efficient with money. That brings the question, do we really need to raise taxes or open more opportunities for charitable foundations to do what gov-t cannot.
there is a parity issue at play... and if you're going to donate there are more efficient ways to do so than giving it to the government (i.e. create three jobs by starting a cafe, invest in startups, etc).