Data in the valuation of Sports Clubs

Data in the valuation of Sports Clubs

There are currently 7 sports with well-known leagues - American Football, Baseball, Basketball, Cricket, Football, Ice Hockey, and Rugby. A total of 165 sports clubs play in these leagues and each of them can be traded by their owners. Sports Clubs are often seen signing multi-million dollar contracts when buying players based on their performance, but how are the clubs themselves valued when its time to buy them?