Books have been said on this matter, and the debates and feuds about where the "hot" one armed bandits are placed in the casino are still raging – over 60 years after one armed bandits were 1st added to the gaming floor in casinos.
The traditional rule is that the very best slot machine games were located just inside the main entry of the casino; so that folks walking by would be able to see jackpot winners and be attracted to come into the casino and play. Our perspective is that this is definitely no longer true.
Just about all of the major casinos these days are giant complexes and it’s no longer possible to see inside from the sidewalk, so there is no longer a reason to place the ‘loose’ slot machines close-by any entrances or exits.
An additional classic rule is that loose slot machines are located on the major aisles inside the casinos, again so that more folks could see winning jackpots and be roused to play. However, we find that this also is not 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 the slot machines 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!
Today, casinos are constantly changing their perspective about where to place the loose one armed bandits.