Only because other sports, particularly team sports, are more diligent in their operations. The second reason is that there is less corruption (though it still exists) and the fact that there is normally only one governing body. Professional sport is rife. The best option for fans is simply to stop moaning about it as if they know any better. The majority of sports fans are not the brightest and are happy to believe what they are told, which is one of the reasons marketing works so well in sport and why sport, as an enterprise, is one of the biggest businesses in existence. Scepticism largely doesn't exist.