Books have been written on this subject, and the controversy and discourse about where the "hot" video slots are located in the casino are still intense – more than 60 years after slot machines were first placed in the casinos.
The traditional rule is that the best slot machine games were placed just inside the main entryway of the casino; so that casino fanatics passing by would be able to see jackpot winners … be infatuated enough to come into the casino and play. Our leaning is that this is definitely no longer so.
Nearly all of the large casinos nowadays are gigantic complexes and it is not possible to see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ one armed bandits near to any exits.
An additional traditional rule is that loose slot machine games are put on the major aisles inside the casinos, again so that more potential players could see winning jackpots and be energized to play. Notably 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 very 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 slots.