Books have been said on this matter, and the controversy and discourse about where the "hot" slot machine games are positioned in a casino are still ongoing – over 60 years after one armed bandits were first added to the gaming floor in the casinos.
The quintessential rule is that the best one armed bandits were positioned just inside the entry of the casino; so that people walking by would be able to see jackpot winners and be smitten to come into the casino … play. Our inference is that this is not so anymore.
Almost all of the big name casinos nowadays are humongous complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slot machine games near any exits.
Yet another standard rule is that loose slot machine games are put on the major aisles in the casinos, again so that more persons could see winning jackpots and be inspired to play. 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 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!
These days, casinos are constantly changing their perspective about where to place the loose slot games.