Books have been set forth on this matter, and the bickering and feuds about where the "hot" slot games are installed in the casino are still raging – over 60 years after the slots were 1st added to the gaming floor in gambling houses.
The classic rule is that the best slot machine games were located just inside the main entry of the casino; so that people passing by would be able to see actual jackpot winners … be attracted to come into the casino and play. Our resolve is that this is no longer true.
The great majority of the large casinos presently are immense complexes … you can no longer see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slots in close proximity to any exits.
Yet another standard rule is that loose slot machine games are installed on the major aisles in the casinos, again so that more potential players could see winning jackpots and be influenced to play. Notably though, 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 the 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 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!
These days, casinos are constantly changing their philosophy about where to place the loose slot machines.