Books have been said on this issue, and the controversy and arguments about where the "hot" slot machine games are placed in the casino are still on-going – over 60 years after slot machine games were 1st installed in casinos.
The quintessential rule is that the more favourable slots were placed just inside the main entryway of the casino; so that folks going by would be able to see actual jackpot winners and be possessed to come inside and play. Our conviction is that this is definitely no longer the case.
Many of the big name casinos presently are enormous complexes and it is not possible to see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slots near to any entrances.
Another standard rule is that loose one armed bandits are positioned on the major aisles in the casinos, again so that more fun seekers could see winning jackpots and be motivated 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 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 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.