Volumes have been stated on this matter, and the disquiet and squabbling about where the "hot" one armed bandits are installed in the casino are still there – sixty years after slots were 1st added to the gaming floor in casinos.
The classic rule is that the best slot machine games were installed just inside the main entryway of the casino; so that everyone walking by would be able to see real jackpot winners and be keen enough to come unto the gaming floor … play. Our perspective is that this is definitely no longer so.
Nearly all of the major casinos nowadays are super-colossal complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ one armed bandits near to any doorways.
Another classic rule is that loose one armed bandits are located on the major aisles inside the casinos, again so that more persons could see winning jackpots and be energized to play. Importantly 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 slot 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!
In recent times, casinos are constantly changing their perspective about where to place the loose slot games.