Books have been written on this matter, and the bickering and squabbling about where the "hot" slot games are positioned in a casino are still passionate – 60 years after slot games were first added to the gaming floor in gambling houses.
The quintessential rule is that the very best slot machines were installed just inside the door of the casino; so that casino fanatics walking by would be able to see jackpot winners … be keen enough to come unto the gambling floor … play. Our feeling is that this is definitely no longer true.
The majority of the mega casinos these days are titanic complexes … you no longer can see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slots near to any entrances or exits.
Yet another standard rule is that loose slots are located on the major aisles in the casinos, again so that more folks could see winning jackpots and be motivated to play. Interestingly though, 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 one armed bandits 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!
Today, casinos are constantly changing their philosophy about where to place the loose slot machine games.