If I have a casino and I notice a particular user has been winning games without losing any single one, I will have to pay close attention to that user as such acts appear very suspicious and I need to look into them. I will then check if there is any special tool that he is using to manipulate the game and how he makes his game selection.
 
If I have done that, I see no difference in his method of bet from others. The only thing I will do in order for him not to send me out of business is to limit the amount he can wager and the amount that he can win on a single bet, but I'm not going to restrict him from playing in my casino; that will be unfair.