6. Maria Sharapova
The famous professional tennis player, Maria Sharapova, uses a credit card, known as the Platinum MasterCard Credit Card, whose issuer is unknown till now. Apart from this, Sharapova also owns one debit card and a gift card, which are Chase Debit Card and American Express Gift Card, respectively. The five times Grand Slam title winner has an estimated net worth of $150 million, still she requires a credit card for her shopping.