Books have been stated on this topic, and the controversy and squabbling about where the "hot" video slots are installed in the casino are still happening – sixty yrs after slot machine games were 1st placed in gambling dens.
The standard rule is that the best slot games were located just inside the main doorway of the casino; so that people passing by would see real jackpot winners … be aroused to come inside and play. Our belief is that this is no longer true.
Most of the large casinos nowadays are grand complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slot machines near any entrances or exits.
An additional classic rule is that loose slots are located on the major aisles in the casinos, again so that more persons could see winning jackpots and be energized to play. 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!
These days, casinos are constantly changing their perspective about where to place the loose slot games.