Books have been said on this issue, and the conflict and discussion about where the "hot" slot machine games are placed in a casino are still on-going – more than sixty years after slot machines were first added to the gaming floor in gambling dens.
The classic rule is that the best slot games were located just inside the entry of the casino; so that potential players walking by would be able to see real jackpot winners … be challenged to come into the casino and play. Our sentiment is that this is not so anymore.
Nearly all of the mega casinos nowadays are mammoth complexes … it is not possible to see inside from the sidewalk, so there is no longer a reason to place the ‘loose’ slot games in close proximity to any exits.
An additional standard rule is that loose slots are placed on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be inspired to play. Importantly 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 slot machine games 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 perspective about where to place the loose slot machines.