Volumes have been set forth on this subject, and the contention and discord about where the "hot" slots are installed in a casino are still intense – sixty years after slot machine games were 1st installed in the casinos.
The traditional rule is that the best slot machines were installed just inside the main doorway of the casino; so that fun seekers going by would be able to see real jackpot winners and be smitten to come into the casino … play. Our perspective is that this is no longer the case.
Many of the major casinos these days are monstrous complexes and you can no longer see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slots near to any entrances.
Yet another standard rule is that loose one armed bandits are positioned on the major aisles inside the casinos, again so that more people could see winning jackpots and be energized to play. Notably 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 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 slot machine games.