Books have been stated on this issue, and the debates and face-offs about where the "hot" one armed bandits are located in a casino are still ongoing – over sixty years after slot games were first placed in the casinos.
The traditional rule is that the best slot games were positioned just inside the entry of the casino; so that everyone walking by would be able to see actual jackpot winners and be intrigued enough to come unto the gambling floor and play. Our theorem is that this is no longer true.
Just about all of the major casinos these days are behemothic complexes and you can no longer see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slot games near any doorways.
Another standard rule is that loose slot games are placed on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be motivated to play. Interestingly though, we find that this also is no longer a universal rule.
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 slots 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 very 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!
In recent times, casinos are constantly changing their perspective about where to place the loose slot machine games.