It's not the same, but even if you are not a billionaire, there comes a point where giving relatively more of your added income serves a greater good (i.e. fund

It's not the same, but even if you are not a billionaire, there comes a point where giving relatively more of your added income serves a greater good (i.e. funding for gov't) than the money just being in your bank account. Once you make more than you need to keep up your lifestyle (at whatever level that may be) the suggestion to give back more is not unjustified.