Books have been written on this topic, and the contention and interchanges about where the "hot" slot machines are installed in the casino are still on-going – more than 60 yrs after slots were 1st added to the gaming floor in gambling dens.
The traditional rule is that the best slot machine games were placed just inside the main entryway of the casino; so that potential players going by would see jackpot winners and be convinced to come unto the gaming floor … play. Our verdict is that this is definitely no longer the case.
Many of the major casinos these days are grand complexes … it’s no longer possible to see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ slot games in close proximity to any doors.
An additional traditional rule is that loose slot games are positioned on the major aisles in the casinos, again so that more potential gamblers could see winning jackpots and be galvanized 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 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!
In recent times, casinos are constantly changing their perspective about where to place the loose slot machine games.