Books have been stated on this item, and the controversy and disharmony about where the "hot" slot machines are placed in a casino are still passionate – 60 yrs after one armed bandits were first placed in casinos.
The standard rule is that the best slot games were put just inside the door of the casino; so that potential players walking by would be able to see actual jackpot winners and be mesmerized enough to come unto the gambling floor and play. Our stance is that this is definitely no longer the case.
Practically all of the mega casinos nowadays are magnificent complexes and you no longer can see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slot games close to any doorways.
Another classic rule is that loose slot games are put on the major aisles in the casinos, again so that more persons could see winning jackpots and be inspired to play. Importantly however, 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 one armed bandits 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!
Nowadays, casinos are constantly changing their perspective about where to place the loose slot games.