Books have been stated on this item, and the bickering and squabbling about where the "hot" slot games are installed in the casino are still ongoing – more than 60 years after slot machines were first placed in gambling dens.
The classic rule is that the superior slots were put just inside the entry of the casino; so that persons passing by would see real jackpot winners … be aroused to come unto the gambling floor … play. Our speculation is that this is definitely no longer the case.
Many of the major casinos presently are grand complexes … you can no longer see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slot machines near to any doors.
Another classic rule is that loose slot games are placed on the major aisles in the casinos, again so that more persons could see winning jackpots and be influenced to play. Notably 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 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 perspective about where to place the loose slot games.