Sometimes each casino person will tell you a different story.   The first time I ever did it the attendant helped show me how to tap and go to banker.   I asked for $300 and he said you know you have to play it on this machine only.   Of course that wasn't the case and I cashed out and tried a different machine.    From what I can see is they just don't have the technology to monitor your coupons when you cycle them among different machines.