Books have been stated on this topic, and the conflict and squabbling about where the "hot" slots are positioned in the casino are still taking place – over 60 yrs after slots were first added to the gaming floor in gambling dens.
The classic rule is that the very best slots were placed just inside the main foyer of the casino; so that individuals going by would see jackpot winners … be inspired to come into the casino … play. Our deduction is that this is no longer the case.
Just about all of the large casinos today are mammoth complexes and you no longer can see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ one armed bandits close to any entrances or exits.
Another traditional rule is that loose slot games are put on the major aisles in the casinos, again so that more potential gamblers could see winning jackpots and be roused to play. 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 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 slot machine games.