The club also had the option to decline your request for them to stop kicking you in the junk. You took your business elsewhere till they stopped kicking you in the junk. Now, knowing that you were rewarded for taking your business elsewhere once, why should I think you would not threaten to do so again if there was something new that you wanted?
Because I'm a rational human being who possesses a sense of fairness. The club continues to provide a service that I enjoy, so I pay their drink prices.