Books have been set forth on this issue, and the conflict and discord about where the "hot" slot machine games are placed in a casino are still happening – more than 60 yrs after the slot machines were first installed in casinos.
The traditional rule is that the more favourable slots were put just inside the main entrance of the casino; so that individuals passing by would be able to see real jackpot winners and be captivated to come unto the gaming floor and play. Our conclusion is that this is not so anymore.
Practically all of the major casinos presently are super-colossal complexes … it is not possible to see inside from the sidewalk, so there’s no longer a reason to position the ‘loose’ slots close to any entrances.
Another standard rule is that loose slot games are located on the major aisles inside the casinos, again so that more potential players could see winning jackpots and be motivated to play. However, 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 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!
These days, casinos are constantly changing their perspective about where to place the loose slot machine games.