Volumes have been written on this matter, and the bickering and discord about where the "hot" slot machine games are positioned in the casino are still passionate – over 60 yrs after the slot machines were 1st added to the gaming floor in gambling houses.
The classic rule is that the better slot machines were located just inside the main entrance of the casino; so that everyone going by would see actual jackpot winners and be baited to come unto the gaming floor … play. Our inclination is that this is no longer the case.
Nearly all of the major casinos presently are magnificent complexes and you no longer can see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slot machines close-by any doors.
Yet another traditional rule is that loose slot machine games are placed on the major aisles in the casinos, again so that more persons could see winning jackpots and be roused to play. Interestingly though, 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!
Nowadays, casinos are constantly changing their perspective about where to place the loose slot machine games.