Maybe that's true, but the examples you picked are pretty bad.

* Isaac Newton lost his dad before he was born and his parents gave him up to live with relatives. He had a very rough childhood.

* Andre Carnegie's family went broke when he was a child, they had no money and had to restart their lives moving to the United States with basically nothing.

* Steve Jobs was adopted, though maybe not exactly poverty it still doesn't sound like a great way to grow up.

That's about 3/7 having rough childhoods and 4/7 having good or average.