Using Case Studies 20.1, 20.2, and 20.3, why does organized sport in a country

 Using Case Studies 20.1, 20.2, and 20.3, why does organized sport in a country like the USA lobby for a continuation of the prohibition of sports betting? 
While betting interest stimulates an interest in sport, indirectly promoting additional revenue, and as Case Study 20.1 illustrated, providing the prospect of a direct revenue stream as well, it also carries dangers. Where betting markets are liquid enough to absorb large bets, criminals have the potential to win large sums of money by persuading sports insiders to manipulate events on the field in their favour.