Books have been said on this topic, and the controversy and squabbling about where the "hot" slot machines are installed in the casino are still raging – over sixty years after slot games were 1st placed in casinos.
The classic rule is that the better slot machines were positioned just inside the door of the casino; so that potential players walking by would be able to see jackpot winners and be intrigued enough to come unto the gambling floor … play. Our leaning is that this is definitely no longer the case.
Practically all of the big name casinos presently are monstrous complexes … you can no longer see inside from the sidewalk, so there’s no longer a reason to place the ‘loose’ slot machine games near to any doorways.
An additional standard rule is that loose slot games are put on the major aisles in the casinos, again so that more potential gamblers could see winning jackpots and be energized to play. Notably though, we find that this also isn’t 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 slot machines 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!
Today, casinos are constantly changing their perspective about where to place the loose one armed bandits.