Books have been written on this item, and the debates and ruckus about where the "hot" video slots are located in a casino are still taking place – 60 years after slot machine games were 1st placed in casinos.
The traditional rule is that the most favorable slot games were located just inside the main foyer of the casino; so that everyone passing by would see real jackpot winners and be challenged to come unto the gambling floor and play. Our slant is that this is no longer true.
Just about all of the mega casinos presently are humongous complexes and it is not possible to see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slot machine games near any doors.
An additional traditional rule is that loose slot games are installed on the major aisles in the casinos, again so that more folks 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 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!
Nowadays, casinos are constantly changing their philosophy about where to place the loose slot machine games.