Volumes have been stated on this topic, and the bickering and disagreement about where the "hot" slot machine games are installed in the casino are still taking place – 60 years after slot machine games were 1st placed in gambling houses.
The quintessential rule is that the better slot machine games were placed just inside the main entryway of the casino; so that individuals walking by would see real jackpot winners … be convinced to come into the casino and play. Our feeling is that this is definitely no longer so.
Most of the mega casinos nowadays are herculean complexes and you no longer can see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ one armed bandits close to any doors.
Another classic rule is that loose slots are put on the major aisles inside the casinos, again so that more potential gamblers could see winning jackpots and be roused to play. 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 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 slot games.