Tickets for Tracking Players in Casinos?

aws910 asks: "I was in Las Vegas recently, and I noticed that most machines now give barcoded tickets as payment instead of coins. These tickets can then be used in other machines as a wager instead of paper money. A basic slot strategy is to move from one machine to another, and play machines in certain areas of the casino floor to improve your odds. With the ticket system, It seems all too easy for someone to build a system to track a player from one machine to another, giving the house the ability to kill the player's (already slim) edge. If a machine knows how much you've already won as soon as you sit down, do you think it will give you good odds? I couldn't find any articles on it. What does Slashdot think about this?"