Books have been stated on this issue, and the debates and discussion about where the "hot" slot machine games are positioned in a casino are still there – over 60 years after the slots were 1st installed in gambling dens.
The traditional rule is that the very best one armed bandits were placed just inside the entrance of the casino; so that persons passing by would be able to see actual jackpot winners and be challenged to come inside and play. Our inference is that this is no longer true.
Nearly all of the mega casinos nowadays are monstrous complexes and you can no longer see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slots near any doorways.
Another classic rule is that loose slot machine games are installed on the major aisles inside the casinos, again so that more potential players could see winning jackpots and be galvanized 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 the 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 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!
Today, casinos are constantly changing their philosophy about where to place the loose slots.