Books have been stated on this topic, and the bickering and disharmony about where the "hot" video slots are installed in the casino are still on-going – over 60 years after slot games were first installed in the casinos.
The classic rule is that the best slots were located just inside the main doorway of the casino; so that casino fanatics passing by would be able to see real jackpot winners … be captivated to come unto the gaming floor and play. Our viewpoint is that this is not so anymore.
The great majority of the large casinos nowadays are behemothic complexes … you no longer can see inside from the sidewalk, so there’s no longer a reason to have the ‘loose’ slot machine games in close proximity to any entrances.
An additional classic rule is that loose slots are installed on the major aisles inside the casinos, again so that more persons could see winning jackpots and be energized to play. However, we find that this also isn’t 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!
These days, casinos are constantly changing their perspective about where to place the loose slot machine games.