I think there are method but need a right strategy to kick in and book a winning.  This simply means that method alone does not guarantee you a winnings or booking a profit when gambling.  You really need to match it with strategy on how you will play that method.  One very popular and used method is using a martingale system tandem with quitting when you experienced a continuous lost and a win at the end.  if you calculate this strategy on that method, it is true that you can book a profit from it with just one win as long as the win is at the last bet before you quit gambling that day.