Many millionaires avoid excess debts because they realize that these debts keep them from saving and investing in order to build wealth. Millionaires who have credit cards won't let their cards accrue unnecessary interest. They strive to pay them off in full on time each month. If you want the best loans or credit cards, it is best to get your credit score to 720 or higher to obtain excellent rates. Here are more millionaire money moves you can make to grow wealth.