Books have been said on this subject, and the debates and interchanges about where the "hot" slots are placed in a casino are still happening – more than sixty yrs after the slots were 1st installed in casinos.
The standard rule is that the most favorable slots were installed just inside the entry of the casino; so that everyone going by would be able to see actual jackpot winners … be captivated to come unto the gambling floor and play. Our leaning is that this is definitely no longer the case.
Nearly all of the big name casinos presently are huge complexes … it’s no longer possible to see inside from the sidewalk, so there is no longer a reason to situate the ‘loose’ slot games in close proximity to any entrances or exits.
Another standard rule is that loose slot machine games are placed on the major aisles in the casinos, again so that more potential players could see winning jackpots and be galvanized to play. Nonetheless, 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!
These days, casinos are constantly changing their philosophy about where to place the loose slot machine games.