Books have been stated on this topic, and the disquiet and discord about where the "hot" slot games are located in the casino are still passionate – over sixty years after slots were first installed in the casinos.
The classic rule is that the most favorable slot machines were positioned just inside the main door of the casino; so that persons going by would see real jackpot winners … be attracted to come unto the gaming floor and play. Our standpoint is that this is definitely no longer the case.
Practically all of the major casinos presently are grand complexes and it’s no longer possible to see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slot machines close to any entrances or exits.
Another classic rule is that loose slot machine games are placed on the major aisles inside the casinos, again so that more persons could see winning jackpots and be roused to play. However, 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 one armed bandits 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 philosophy about where to place the loose one armed bandits.