Without fans there would be no gamblers. To be a gambler in horse racing you have to have some "fan" in you. Otherwise, you'd play a shot machine which produces the results of your gamble much quicker than waiting for a horse race. 
 
And without gamblers there would be no horse racing. It might exist, but not nearly on the scale it is today. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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