Volumes have been stated on this topic, and the contention and ruckus about where the "hot" slot machine games are installed in a casino are still ongoing – over sixty yrs after slot games were first placed in gambling dens.
The quintessential rule is that the very best slots were placed just inside the main doorway of the casino; so that potential gamblers going by would see real jackpot winners … be impressed enough to come into the casino and play. Our position is that this is no longer true.
The great majority of the big name casinos today are colossal complexes … it’s no longer possible to see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ one armed bandits near any exits.
Yet another traditional rule is that loose one armed bandits are installed on the major aisles in the casinos, again so that more potential players could see winning jackpots and be inspired to play. Notably however, 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 one armed bandits 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!
Nowadays, casinos are constantly changing their perspective about where to place the loose slots.