Books have been said on this matter, and the contention and disagreement about where the "hot" slot machine games are located in a casino are still bubbling – over 60 yrs after slot machine games were 1st placed in casinos.
The classic rule is that the very best slot machines were located just inside the entrance of the casino; so that people going by would be able to see real jackpot winners … be convinced to come inside and play. Our perspective is that this is no longer true.
The great majority of the large casinos these days are herculean complexes and now you can’t see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ one armed bandits close-by any of the doors.
Yet another classic rule is that loose one armed bandits are installed on the major aisles inside the casinos, again so that more persons could see winning jackpots and be energized 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 one armed bandits 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.