Books have been stated on this topic, and the controversy and disagreement about where the "hot" slot games are located in a casino are still happening – over 60 yrs after slots were 1st placed in gambling dens.
The quintessential rule is that the very best slot games were placed just inside the main entrance of the casino; so that everyone walking by would be able to see actual jackpot winners and be enticed to come into the casino and play. Our assurance is that this is definitely no longer the case.
Just about all of the mega casinos today are enormous complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to have the ‘loose’ slot machines close-by any of the doors.
Yet another traditional rule is that loose slots are located on the major aisles inside the casinos, again so that more potential gamblers could see winning jackpots and be motivated to play. Importantly though, 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 slot 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!
These days, casinos are constantly changing their perspective about where to place the loose slot machine games.