Books have been stated on this issue, and the contention and arguments about where the "hot" slot games are installed in the casino are still bubbling – 60 yrs after the slots were 1st placed in gambling houses.
The traditional rule is that the very best slots were put just inside the main door of the casino; so that everyone going by would be able to see jackpot winners and be influenced to come unto the gambling floor … play. Our thought is that this is no longer the case.
Most of the mega casinos today are super-colossal complexes … you can no longer see inside from the sidewalk, so there’s no longer a reason to put the ‘loose’ slot games near to any entrances.
Yet another standard rule is that loose slot machines are put on the major aisles in the casinos, again so that more potential players 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 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!
Nowadays, casinos are constantly changing their philosophy about where to place the loose slot machines.