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Books have been set forth on this topic, and the controversy and arguments about where the "hot" slot games are installed in the casino are still on-going – 60 yrs after the slots were first placed in gambling dens.

The classic rule is that the best one armed bandits were positioned just inside the main foyer of the casino; so that potential players passing by would be able to see actual jackpot winners and be mesmerized enough to come unto the gambling floor and play. Our presumption is that this is definitely no longer so.

Many of the large casinos presently are super-colossal complexes … you can no longer see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slots near to any entrances or exits.

Another traditional rule is that loose slots are placed on the major aisles in the casinos, again so that more potential players could see winning jackpots and be encouraged 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 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!

These days, casinos are constantly changing their philosophy about where to place the loose slots.