Books have been stated on this subject, and the controversy and discourse about where the "hot" slot machines are placed in a casino are still intense – over sixty years after slot games were first added to the gaming floor in casinos.
The traditional rule is that the most favorable slot machine games were installed just inside the door of the casino; so that potential gamblers walking by would see jackpot winners and be drawn to come unto the gaming floor and play. Our presumption is that this is definitely no longer true.
Many of the big name casinos today are oversized complexes … you no longer can see inside from the sidewalk, so there is no longer a reason to situate the ‘loose’ slot machine games near any doors.
Yet another traditional rule is that loose slot machine games are located on the major aisles in the casinos, again so that more folks could see winning jackpots and be galvanized to play. Notably however, 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 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.