Volumes have been set forth on this topic, and the debates and disharmony about where the "hot" one armed bandits are located in a casino are still there – sixty yrs after slot games were first added to the gaming floor in gambling dens.
The standard rule is that the very best slot machine games were put just inside the entry of the casino; so that casino fanatics walking by would see jackpot winners … be challenged to come inside and play. Our disposition is that this is not so anymore.
Just about all of the big name casinos today are colossal complexes and you can no longer see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slot machine games in close proximity to any doorways.
An additional traditional rule is that loose slot machines are installed on the major aisles in the casinos, again so that more potential players 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 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!
Nowadays, casinos are constantly changing their perspective about where to place the loose slot games.