Here is an interesting article I found. I'm passing it on to you because as it states, The casinos tell you virtually nothing about slot machines .The Illinois Gaming Board, the Indiana Gaming Commission and other gaming jurisdictions around the country reveal penny slots are making more and more money for casinos nationwide. OK , you may say. So what? I just PLAY the slots. I don't own a casino! But the fact of the matter is this: The casinos tell you virtually nothing about slot machines. Whatever information you can extrapolate from the statistics that they are required by law to turn over to the state will be as much or more information as you could garner from any other source.The reason for the increase in the number of penny slots is obvious. The collective hold percentage (the amount of money wagered on the machines that is retained by the casino) is higher than any other denomination.Read the full article <a href="http://www.nwitimes.com/entertainment/columnists/john-brokopp/casino-scene-one-cent-slots-are-pennies-from-heaven-for/article_835dfff2-a2f9-522c-ac9e-1d48917e69fa.html#ixzz1ksmqJhxZ" >here</a>.