Volumes have been said on this matter, and the contention and ruckus about where the "hot" slot machine games are positioned in a casino are still bubbling – 60 years after one armed bandits were first added to the gaming floor in casinos.
The classic rule is that the very best slot machines were located just inside the entrance of the casino; so that potential gamblers going by would be able to see jackpot winners … be challenged to come into the casino and play. Our philosophy is that this is definitely no longer true.
The majority of the major casinos today are titanic complexes and it is not possible to see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ slot machines near any doors.
Yet another traditional rule is that loose slots are installed on the major aisles inside the casinos, again so that more potential gamblers could see winning jackpots and be energized 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 slot 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 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.