Books have been said on this topic, and the debates and disagreement about where the "hot" video slots are located in a casino are still taking place – more than sixty years after the slots were 1st placed in gambling dens.
The traditional rule is that the best slot machines were put just inside the entry of the casino; so that potential gamblers going by would see jackpot winners … be captivated to come into the casino and play. Our observation is that this is definitely no longer true.
The great majority of the big name casinos these days are massive complexes … it is not possible to see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slots close to any of the doors.
Yet another standard rule is that loose slot games are put on the major aisles in the casinos, again so that more potential players could see winning jackpots and be encouraged to play. Importantly however, we find that this also is not 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 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 perspective about where to place the loose slot games.