I think most people forget one of the biggest contributions that Billionaires bring to the economy, namely : Job creation
You mentioned that they only contribute 3% to the taxes of a country, but how much is 3% of say 5 Billion Dollars... for only 1 person. How many services can be paid by that contribution and how many government salaries can be paid by that.
They also create a lot of jobs in the private sector and those people also pay taxes and that money is also being used to fund projects in the public sector.
This is just something I wanted to say here. Just perfect. Obviously man, why wouldn't they be rich? They are running A to Z around the world and what makes us think they are just enjoying in their little cocoon? They also started at some point. Some of them started from history for that matter and everything came down as thrones passed from generation to generation. But they are not just sitting somewhere and doing nothing? They have businesses, they have their leaderships running big companies and giving us employment.
If a poor man is frightened that how he will eat tonight, from where the money will come to him and etc etc, then just remember he is only thinking about himself or may be two or three family dependents.
BUT, let us not forget one thing, whenever there is the 30th or 31st of any month, the rich who runs the company has to preplan everyone's salary distribution and has to send millions of dollars from his share for the work we did and on which we pay the bills for food, travel, luxury and what not.
So come on, if there are rich peeps, then there is nothing wrong.