Books have been stated on this item, and the contention and ruckus about where the "hot" slot games are placed in the casino are still bubbling – 60 yrs after slot games were first installed in casinos.
The classic rule is that the better slot games were installed just inside the entry of the casino; so that persons passing by would be able to see real jackpot winners and be challenged to come unto the gambling floor and play. Our view is that this is definitely no longer so.
The majority of the major casinos presently are colossal complexes and you can no longer see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slot games close-by any entrances or exits.
Yet another classic rule is that loose slot machines are located on the major aisles in the casinos, again so that more persons could see winning jackpots and be encouraged to play. Notably though, we find that this also is not 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 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 philosophy about where to place the loose slots.