Ye Fan's objective in doing this was to make Pan Xing face the harsh reality and to let him know that gambling wasn't something everyone could engage in—if you lack the skills, then you're just an ATM for others. Of course, even if you have skills, you shouldn't gamble often. As the saying goes, "There's always someone better out there, and there's always a higher mountain." If you happen to meet a stronger master, by then, not even tears will help.
Now that Pan Xing had taken the initiative to ask to watch, Ye Fan didn't hesitate for a moment and immediately agreed, "You can watch, but you can't speak, and, I'm letting you watch not to show you how I win money, but to make you understand that gambling isn't for the average person. It's best to stay away from it."