Books have been set forth on this matter, and the controversy and disagreement about where the "hot" slot games are placed in a casino are still bubbling – over 60 yrs after slot machines were first added to the gaming floor in casinos.
The standard rule is that the best one armed bandits were installed just inside the main entryway of the casino; so that everyone passing by would be able to see actual jackpot winners and be drawn to come into the casino and play. Our sneaking suspicion is that this is no longer true.
Nearly all of the large casinos today are herculean complexes … you can no longer see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slot machine games near any of the doors.
An additional classic rule is that loose slot machines are put on the major aisles in the casinos, again so that more potential gamblers could see winning jackpots and be galvanized to play. Importantly 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 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!
In recent times, casinos are constantly changing their perspective about where to place the loose slots.