Volumes have been stated on this topic, and the contention and ruckus about where the "hot" slots are positioned in a casino are still rampant – more than sixty yrs after slots were first installed in the casinos.
The quintessential rule is that the best slots were placed just inside the main foyer of the casino; so that people going by would be able to see jackpot winners … be possessed to come into the casino … play. Our sneaking suspicion is that this is not so anymore.
Most of the major casinos nowadays are behemothic complexes … you no longer can see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ one armed bandits near any doors.
Yet another classic rule is that loose slots are located on the major aisles in the casinos, again so that more persons could see winning jackpots and be energized 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 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 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 philosophy about where to place the loose slot machine games.