10. David Cook
Winner, Season 7
Number of albums sold: 2,011,000
Net worth: $5 million
David Cook was part of the “finale with two Davids” with David Archuleta as his rival. He won with 56% of the total votes in season 7 and that’s when his post idol career began. His first album released in 2008 went on to be declared platinum, making Cook the first person on our list to have gotten this honor, but here are many more to come!