Books have been said on this matter, and the contention and arguments about where the "hot" slot games are installed in a casino are still bubbling – 60 yrs after slot games were first placed in gambling dens.
The quintessential rule is that the more favourable slot machine games were located just inside the entrance of the casino; so that casino fanatics passing by would be able to see jackpot winners … be possessed to come unto the gambling floor … play. Our interpretation is that this is no longer true.
Nearly all of the big name casinos these days are gigantic complexes … it’s no longer possible to see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slot machine games close to any exits.
An additional standard rule is that loose slot machine games are positioned on the major aisles in the casinos, again so that more people 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 one armed bandits 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 slot games.