Books have been said on this subject, and the debates and disharmony about where the "hot" video slots are placed in a casino are still happening – sixty yrs after slot machines were first placed in casinos.
The classic rule is that the more favourable slot games were placed just inside the entrance of the casino; so that potential gamblers going by would see jackpot winners … be stirred to come into the casino and play. Our conviction is that this is no longer true.
The majority of the mega casinos nowadays are herculean complexes … now you can’t see inside from the sidewalk, so there is no longer a reason to place the ‘loose’ slot machine games near to any entrances.
Another classic rule is that loose slots are positioned on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be inspired 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 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!
Nowadays, casinos are constantly changing their philosophy about where to place the loose slot machine games.