There are people who live in those simple houses and are very happy compared to many people who live in their palaces.
Same 8 men will lose the wealth of half the world... when they die. 
I agree
it is true only 8 richest man, and there are a quarter people on earth who live in poverty.
Many of these billionaires have fortune because they Harms many people
it is true only 8 richest man, and there are a quarter people on earth who live in poverty.
They are poor because they were producing dozens of children each, rather than concentrating on education. Even if the super-rich donates a part of their fortune to these people, they will return to poverty after a short while. There is only one permanent method to end poverty - family planning.
Would be a solution, but as long as poor countries are run by unscrupulous people, will hardly escape poverty.