The latest Forbes ranking has the NFL's Dallas Cowboys as the most valuable sports team in the world for the second year in a row with $4.2 billion. In fact, the NFL is the most profitable league on the planet. The average team enjoys an operating profit of $91 million, while no franchise earned less than $26 million. 

Despite underperforming since the departure of manager Sir Alex Ferguson in 2013, Manchester United remains a financial powerhouse, claiming third place in the ranking and the most valuable soccer team at $3.69 billion.

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