Volumes have been set forth on this topic, and the disquiet and disagreement about where the "hot" slot machines are placed in a casino are still ongoing – more than 60 yrs after one armed bandits were first installed in gambling dens.
The standard rule is that the better slot machine games were put just inside the main entryway of the casino; so that everyone walking by would see real jackpot winners … be captivated to come unto the gaming floor … play. Our slant is that this is definitely no longer true.
The great majority of the mega casinos these days are super-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 close to any doors.
Another classic rule is that loose one armed bandits are installed on the major aisles inside the casinos, again so that more people could see winning jackpots and be galvanized 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 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 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 philosophy about where to place the loose slot games.