Books have been set forth on this matter, and the conflict and ruckus about where the "hot" video slots are placed in the casino are still on-going – more than sixty years after the slots were 1st added to the gaming floor in gambling dens.
The standard rule is that the very best slots were put just inside the main door of the casino; so that persons passing by would be able to see real jackpot winners … be captivated to come into the casino … play. Our viewpoint is that this is definitely no longer the case.
The great majority of the mega casinos these days are titanic complexes and it’s no longer possible to see inside from the sidewalk, so there is no longer a reason to have the ‘loose’ slot machine games near to any of the doors.
An additional classic rule is that loose slots are positioned on the major aisles in the casinos, again so that more potential players could see winning jackpots and be roused 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 slot machine 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!
Nowadays, casinos are constantly changing their philosophy about where to place the loose slots.