Volumes have been stated on this issue, and the conflict and disagreement about where the "hot" slot machine games are installed in a casino are still bubbling – over sixty years after slot machines were first placed in gambling houses.
The standard rule is that the very best slot machines were put just inside the entrance of the casino; so that potential gamblers going by would see actual jackpot winners … be mesmerized enough to come unto the gambling floor … play. Our assurance is that this is not so anymore.
The great majority of the mega casinos today are jumbo complexes and it is not possible to see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slots close-by any entrances.
An additional traditional rule is that loose one armed bandits are located on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be influenced to play. 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 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!
Nowadays, casinos are constantly changing their perspective about where to place the loose one armed bandits.