Books have been written on this item, and the disquiet and disagreement about where the "hot" slot machine games are placed in a casino are still there – more than sixty yrs after slot games were first added to the gaming floor in gambling houses.
The quintessential rule is that the most favorable slot games were positioned just inside the entry of the casino; so that potential players passing by would see jackpot winners and be impressed enough to come unto the gaming floor … play. Our resolve is that this is definitely no longer true.
Almost all of the large casinos nowadays are immense complexes and you no longer can see inside from the sidewalk, so there is no longer a reason to situate the ‘loose’ slots in close proximity to any of the doors.
An additional standard rule is that loose slot games are positioned on the major aisles in the casinos, again so that more fun seekers could see winning jackpots and be roused to play. Notably however, 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 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 perspective about where to place the loose slot machines.