Books have been stated on this topic, and the bickering and arguments about where the "hot" slot games are installed in the casino are still happening – more than sixty yrs after slot machines were first placed in casinos.
The classic rule is that the better slots were placed just inside the main entryway of the casino; so that fun seekers going by would see jackpot winners … be captivated to come unto the gambling floor … play. Our assessment is that this is definitely no longer true.
Most of the big name casinos presently are humongous complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slot games in close proximity to any exits.
An additional standard rule is that loose slot machines are located on the major aisles inside the casinos, again so that more potential players could see winning jackpots and be energized to play. Importantly though, we find that this also isn’t a universal rule any more.
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 machine 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 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!
In recent times, casinos are constantly changing their philosophy about where to place the loose slot games.