Volumes have been said on this subject, and the contention and squabbling about where the "hot" slot machine games are placed in a casino are still taking place – more than 60 yrs after slot games were first installed in the casinos.
The standard rule is that the very best slot games were installed just inside the main foyer of the casino; so that individuals passing by would see real jackpot winners … be attracted to come unto the gaming floor … play. Our inference is that this is not so anymore.
Most of the mega casinos presently are massive complexes … you no longer can see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slot machine games near to any entrances.
Another standard rule is that loose slot games are placed on the major aisles inside the casinos, again so that more persons could see winning jackpots and be energized to play. Importantly though, 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 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!
These days, casinos are constantly changing their perspective about where to place the loose slots.