Not surprising at all. If there is one thing that billionaires love is to find ways to keep the involuntary down - thats how their product continues to increase in value. Let me ask you something: if the world has 25 people each worth over 500 billion dollars, then why does poverty still exist. I mean, thats enough money to donate one million to each family in the world, with enough money left over to still maintain their billionaire status? Well, because there would be less demand for their product when everyone is a millionaire. That how rich people look at it. So, Russians are trying to maintain a class-based society by doing this. Absolutely disputable!!!
Bill Gates is currently the richest man in the world and his net worth was 90 billion as of July this year. So there really isn't even 1/5th of a person with 500 billion dollars

As I understand, Bill Gates will give vast majority of his wealth to charity and so will his friend Warren Buffet (I believe he said he will give 99%), the second wealthiest man in the world. So this clearly doesn't apply to everyone. It is kind of useless to just sit on that money, so they give it away to people in need.
I believe that most of the richest people would want poverty gone. Not just out of the good hearth, but also because their products aren't really something that people in poverty buy. How many of billionaires you know that got rich of selling cheap food?
I really don't think that many people benefit from poor people in Africa, dieing of thirst, hunger and easily preventable diseases.