Volumes have been set forth on this item, and the debates and discussion about where the "hot" slot games are installed in a casino are still happening – more than 60 yrs after one armed bandits were 1st placed in gambling houses.
The standard rule is that the very best slot games were placed just inside the main entryway of the casino; so that everyone going by would see jackpot winners and be possessed to come unto the gambling floor … play. Our frame of mind is that this is not so anymore.
The great majority of the large casinos today are behemothic complexes and you no longer can see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slot machines near to any of the doors.
An additional classic rule is that loose slot machines are put on the major aisles inside the casinos, again so that more potential gamblers could see winning jackpots and be motivated to play. Nonetheless, 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 very 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 slot machines.