Volumes have been stated on this topic, and the contention and disharmony about where the "hot" slot machine games are installed in the casino are still rampant – over sixty yrs after slots were 1st installed in casinos.
The classic rule is that the better slot games were located just inside the main entryway of the casino; so that people passing by would be able to see real jackpot winners and be stirred to come unto the gaming floor and play. Our presumption is that this is definitely no longer so.
Most of the large casinos nowadays are giant complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slot machines near to any doors.
Another classic rule is that loose slot machine games are put on the major aisles in the casinos, again so that more potential players could see winning jackpots and be galvanized to play. Interestingly 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!
Today, casinos are constantly changing their philosophy about where to place the loose slots.