Books have been set forth on this topic, and the disquiet and interchanges about where the "hot" slot machines are installed in a casino are still rampant – more than 60 years after slots were first placed in casinos.
The standard rule is that the very best slot machines were located just inside the entry of the casino; so that people passing by would see jackpot winners and be challenged to come inside and play. Our sentiment is that this is no longer the case.
Many of the mega casinos today are herculean complexes and it is not possible to see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ slots in close proximity to any entrances.
Another classic rule is that loose one armed bandits are put on the major aisles in the casinos, again so that more potential gamblers could see winning jackpots and be galvanized to play. Interestingly though, 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 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 one armed bandits.