Books have been set forth on this issue, and the debates and squabbling about where the "hot" slot machines are placed in the casino are still rampant – over 60 yrs after slots were first installed in the casinos.
The quintessential rule is that the more favourable slot machine games were placed just inside the entrance of the casino; so that potential players passing by would be able to see real jackpot winners … be stimulated to come unto the gaming floor … play. Our reasoning is that this is definitely no longer the case.
Nearly all of the big name casinos presently are colossal complexes and now you can’t see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slots in close proximity to any entrances.
An additional standard rule is that loose one armed bandits are put on the major aisles in the casinos, again so that more people could see winning jackpots and be encouraged 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 slot 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!
These days, casinos are constantly changing their perspective about where to place the loose one armed bandits.