Books have been stated on this topic, and the conflict and ruckus about where the "hot" slot games are positioned in the casino are still rampant – over sixty years after slot games were first placed in gambling houses.
The standard rule is that the very best slot machines were located just inside the main entrance of the casino; so that potential players walking by would see jackpot winners … be possessed to come into the casino and play. Our estimation is that this is no longer true.
Most of the big name casinos nowadays are immense complexes … it is not possible to see inside from the sidewalk, so there is no longer a reason to put the ‘loose’ slot games near any entrances or exits.
Yet another classic rule is that loose slot machines are located on the major aisles in the casinos, again so that more potential players could see winning jackpots and be encouraged to play. Notably 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 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!
In recent times, casinos are constantly changing their philosophy about where to place the loose one armed bandits.