Volumes have been stated on this issue, and the conflict and squabbling about where the "hot" slot machine games are positioned in a casino are still intense – more than 60 years after slots were 1st placed in gambling houses.
The quintessential rule is that the most favorable slot machine games were positioned just inside the door of the casino; so that individuals going by would be able to see actual jackpot winners and be tempted to come unto the gaming floor and play. Our theorem is that this is no longer true.
Nearly all of the large casinos presently are monstrous complexes and it is not possible to see inside from the sidewalk, so there’s no longer a reason to have the ‘loose’ slot machines close-by any entrances.
Another classic rule is that loose slot games are located on the major aisles inside the casinos, again so that more potential gamblers could see winning jackpots and be influenced 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 slots 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 one armed bandits.