Volumes have been written on this matter, and the disquiet and squabbling about where the "hot" slot machine games are placed in the casino are still passionate – more than sixty years after the slot machines were first placed in casinos.
The classic rule is that the best slot machines were installed just inside the main entryway of the casino; so that individuals going by would see jackpot winners … be possessed to come unto the gambling floor … play. Our leaning is that this is definitely no longer the case.
Many of the mega casinos presently are colossal complexes … it’s no longer possible to see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ slot machine games near to any doorways.
An additional traditional rule is that loose slots are put on the major aisles inside the casinos, again so that more folks could see winning jackpots and be inspired to play. 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 the 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 slots.