We just learned in the last week that just 85 people have the combined wealth of the bottom 50% (3.5 billion) people.
I agree with sellew - many of the mega-wealthy would rather buy their 50th vintage car, gold-plate their taps, fly by interior-designed private jet, etc than lift a finger to help the poorest realize their own opportunities. We still see millions dying of preventable diseases. If you looked at the spending behind FIYH's malaria-athon choice of charity, it's quite easy to save lives, but we in the west don't do it enough. Bill Gates is trying, as are a few others (e.g. eradication of polio) but for every virtuous philanthropist, there's the Koch Brothers or Rupert Murdoch.