Volumes have been written on this matter, and the contention and discussion about where the "hot" slot machine games are installed in a casino are still raging – over 60 yrs after the slot machines were 1st placed in casinos.
The traditional rule is that the better one armed bandits were put just inside the entry of the casino; so that potential players walking by would be able to see jackpot winners … be impressed enough to come inside and play. Our estimation is that this is not so anymore.
Nearly all of the big name casinos today are oversized complexes … now you can’t see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slots close-by any entrances.
Another classic rule is that loose one armed bandits are placed on the major aisles inside the casinos, again so that more people could see winning jackpots and be influenced 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 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 perspective about where to place the loose one armed bandits.