5. Dallas Cowboy (NFL)

$2.1 billion

The Cowboys have been the NFL's most valuable team since 2007 thanks to the league's highest sponsorship and premium seating revenues - a combined $200 million. The 'Boys inked QB Tony Romo to a six-year, $108 million contract extension in March despite only one playoff win during his eight years under center.

Officials carry caps of the St. Louis Rams, Dallas Cowboys and Chicago Bears (L-R) into New York's Radio City Music Hall, before the start of the 2013 NFL Draft, April 25, 2013. [Photo/Agencies]