Volumes have been set forth on this matter, and the controversy and squabbling about where the "hot" slots are located in the casino are still passionate – more than 60 yrs after the slot machines were first placed in casinos.
The standard rule is that the very best slot games were installed just inside the entrance of the casino; so that people walking by would see real jackpot winners and be smitten to come into the casino and play. Our point of view is that this is definitely no longer true.
Nearly all of the mega casinos presently are massive complexes … you can no longer see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ one armed bandits close-by any exits.
An additional standard rule is that loose slots are placed on the major aisles inside the casinos, again so that more potential players could see winning jackpots and be inspired to play. Nonetheless, 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 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 philosophy about where to place the loose slots.