Books have been stated on this issue, and the bickering and discord about where the "hot" slot machines are located in a casino are still intense – more than 60 years after slot machines were first placed in the casinos.
The classic rule is that the more favourable slot games were positioned just inside the entry of the casino; so that casino fanatics going by would see actual jackpot winners and be intrigued enough to come unto the gaming floor and play. Our deduction is that this is no longer true.
Most of the major casinos nowadays are huge complexes … you can no longer see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slot machine games in close proximity to any entrances or exits.
An additional classic rule is that loose slot games are placed on the major aisles in the casinos, again so that more folks could see winning jackpots and be influenced to play. However, 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 slots 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 machine games.