Volumes have been stated on this subject, and the contention and interchanges about where the "hot" slot machines are positioned in the casino are still raging – over sixty years after the slot machines were first installed in gambling houses.
The traditional rule is that the best slot machines were installed just inside the main doorway of the casino; so that everyone going by would be able to see jackpot winners … be convinced to come unto the gambling floor and play. Our frame of mind is that this is definitely no longer the case.
Just about all of the mega casinos today are herculean complexes … now you can’t see inside from the sidewalk, so there is no longer a reason to position the ‘loose’ one armed bandits in close proximity to any entrances.
Another classic rule is that loose slot machines are installed on the major aisles in the casinos, again so that more fun seekers could see winning jackpots and be encouraged to play. Notably though, we find that this also isn’t 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 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 one armed bandits.

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