Books have been said on this topic, and the controversy and arguments about where the "hot" slot games are located in the casino are still ongoing – 60 yrs after slot machine games were 1st installed in gambling houses.
The traditional rule is that the better slot machine games were placed just inside the main doorway of the casino; so that fun seekers walking by would see jackpot winners … be titillated to come inside and play. Our opinion is that this is definitely no longer so.
Many of the mega casinos nowadays are jumbo complexes … you no longer can see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slots near to any entrances.
Yet another traditional rule is that loose slot machines are positioned on the major aisles in the casinos, again so that more persons could see winning jackpots and be galvanized to play. Notably 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 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!
Nowadays, casinos are constantly changing their perspective about where to place the loose slot games.