Books have been written on this item, and the debates and arguments about where the "hot" slot games are located in a casino are still ongoing – over sixty yrs after the slot machines were first placed in gambling houses.
The standard rule is that the very best slot machine games were located just inside the main foyer of the casino; so that folks going by would see real jackpot winners … be captivated to come into the casino … play. Our philosophy is that this is definitely no longer so.
Almost all of the mega casinos presently are titanic complexes … it is not possible to see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slot machines close to any exits.
Another classic rule is that loose slot machine games are located on the major aisles inside the casinos, again so that more potential gamblers could see winning jackpots and be galvanized to play. Importantly however, 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 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!
Today, casinos are constantly changing their perspective about where to place the loose slot machine games.