Volumes have been said on this item, and the contention and ruckus about where the "hot" one armed bandits are positioned in a casino are still rampant – 60 yrs after slot machines were first installed in the casinos.
The traditional rule is that the more favourable slots were put just inside the entry of the casino; so that people walking by would see jackpot winners and be impressed enough to come unto the gaming floor … play. Our inclination is that this is definitely no longer true.
Many of the large casinos presently are gigantic complexes and you no longer can see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slots close-by any of the doors.
An additional classic rule is that loose slot machines are put on the major aisles in the casinos, again so that more potential players could see winning jackpots and be galvanized to play. However, 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 slot machines 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 perspective about where to place the loose slot machine games.

