Books have been set forth on this item, and the debates and discussion about where the "hot" slot machine games are placed in the casino are still rampant – sixty years after slot machine games were first installed in casinos.
The standard rule is that the best slot machines were placed just inside the door of the casino; so that fun seekers going by would be able to see jackpot winners and be aroused to come unto the gaming floor … play. Our disposition is that this is not so anymore.
Nearly all of the large casinos presently are herculean complexes and now you can’t see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ one armed bandits close to any doorways.
Another classic rule is that loose slot games are installed on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be galvanized to play. Notably however, we find that this also isn’t a universal rule any more.
What casinos found over the years is that people walking down the busy aisles were frequently on the way to somewhere else. If they played the slot machines at all, they would simply put in their loose change because they happened to be walking by. Win or lose, they would very often not stop to keep playing. And the last thing a casino wants is for someone to win a jackpot by playing only a few coins and then not stay to put it all back in!
Today, casinos are constantly changing their perspective about where to place the loose slots.