Wealthy people are in the good type debt. Good debt is money borrowed to invest in a business like real estate , restaurants, or property whose value will bring in more money than the debt. However bad debt is there borrowed to buy liabilities. This is where the wealthy are smart. Their debts are the good kind of debt that increases their wealth despite being in debts.
It takes a different level of confidence to get into debt, and this kind of confidence is usually not common among people who are not rich or people who have not come across a certain amount of money in their lives before. Also many poor people are not capable of getting into the good debts because they do not have the collateral for this sort of loans from banks or individuals, because there are even people that would not lend you some amount of money that they know you cannot pay back. Before you can get some good loans you need to have some good collateral, and rich people have this, so they can easily take these loans.