Books have been written on this matter, and the conflict and disharmony about where the "hot" slot games are installed in the casino are still intense – 60 yrs after slot machine games were first placed in gambling houses.
The classic rule is that the most favorable slot machine games were positioned just inside the main entrance of the casino; so that potential gamblers passing by would be able to see actual jackpot winners and be infatuated enough to come into the casino … play. Our philosophy is that this is definitely no longer the case.
The great majority of the mega casinos these days are huge complexes and now you can’t see inside from the sidewalk, so there is no longer a reason to put the ‘loose’ slot games close to any of the doors.
Another traditional rule is that loose slots are located on the major aisles inside the casinos, again so that more folks could see winning jackpots and be energized to play. Importantly 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 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!
In recent times, casinos are constantly changing their perspective about where to place the loose slot games.