I also attended the convention in Las Vegas and attempted to play the O'sheas machines. I arrived at around 11:30 PM on Wednesday night and found the same two people on each machine at around 2:00 AM Thursday morning. I waited behind one guy to play the machine for over two hours. He was loading hundred dollar bills into the machine and had won several racks while I watched. At around 2:00 AM on Thursday morning he emptied the machine for the final time and the casino staff shook his hand and congratulated him. At one point he even paid the casino worker one dollar to watch his machine while he visited the restroom and he leaned his chair against the machine. Everyone should boycott dealers such as this as they are not collectors and not good for the hobby. After he had finished he left the casino and had a friend at the machine catalog and check the casings for cracks.