Books have been set forth on this topic, and the disquiet and squabbling about where the "hot" video slots are placed in the casino are still raging – 60 yrs after slot machine games were 1st placed in gambling houses.
The standard rule is that the best slot games were put just inside the main entrance of the casino; so that people walking by would see real jackpot winners … be influenced to come inside … play. Our attitude is that this is definitely no longer true.
Many of the large casinos these days are gigantic complexes and you no longer can see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slot machine games close to any entrances or exits.
An additional standard rule is that loose slot machine games are put on the major aisles in the casinos, again so that more fun seekers could see winning jackpots and be encouraged to play. Importantly 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 slot machine games 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 one armed bandits.