Books have been set forth on this topic, and the bickering and discussion about where the "hot" slot machine games are located in a casino are still raging – sixty years after slot games were 1st installed in the casinos.
The traditional rule is that the best slots were installed just inside the main entryway of the casino; so that people going by would see jackpot winners and be challenged to come unto the gambling floor … play. Our conclusion is that this is not so anymore.
The majority of the major casinos today are herculean complexes and it is not possible to see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slots near to any entrances.
Yet another classic rule is that loose slot games are located on the major aisles inside the casinos, again so that more persons could see winning jackpots and be inspired 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 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 philosophy about where to place the loose slot machine games.