That's why those people are not millionaires. Poor spending habits are very common, people don't look for better deals, don't bargain, don't control themselves, don't invest money and then wonder why they are so broke.
Yeah half of the problem is that, the other half being some people just have more resources to become more successful... Its not the only contributing factor but its one of the things that defines a difference between those with a few thousand and those with a few ten-hundred thousand (at least where wages are pretty high) ...