I came from dirt poor and I'm wealthy now. In my opinion the key to success comes down to a few things.
Education
Need
Luck
Education: My mother made $15k per year and my private school tuition was $375/month. This also provided me with friends that were not dirt poor (this also helps a lot). My wife received the best education the Soviet Union had to offer, which is better than anything we could even imagine stateside.
Need: Hunger is s great motivator. It also gives you this every present fear that if you take your foot off the gas, you'll be hungry again.
Luck: This one is obvious. Plenty of people are hungry and plenty of people have good educations and still struggle.
I think my wife and I did well because we teamed up early. Had we tried solo I think we would have failed.