Volumes have been stated on this matter, and the conflict and feuds about where the "hot" slot games are positioned in the casino are still there – more than 60 years after slots were first placed in gambling dens.
The standard rule is that the superior slot machine games were put just inside the main entrance of the casino; so that everyone walking by would be able to see actual jackpot winners and be infatuated enough to come unto the gambling floor … play. Our leaning is that this is not so anymore.
Nearly all of the major casinos these days are gigantic complexes and you can no longer see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slots near any exits.
Another traditional rule is that loose one armed bandits are located on the major aisles in the casinos, again so that more fun seekers could see winning jackpots and be inspired to play. Notably however, we find that this also is no longer a universal rule.
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!
In recent times, casinos are constantly changing their philosophy about where to place the loose one armed bandits.