Volumes have been stated on this matter, and the conflict and interchanges about where the "hot" slots are installed in a casino are still on-going – more than 60 yrs after the slot machines were 1st placed in gambling houses.
The classic rule is that the more favourable slot machine games were located just inside the main entryway of the casino; so that potential gamblers walking by would see real jackpot winners and be captivated to come inside and play. Our inference is that this is definitely no longer so.
Many of the big name casinos these days are enormous complexes and now you can’t see inside from the sidewalk, so there’s no longer a reason to situate the ‘loose’ slot machine games near to any doorways.
Another traditional rule is that loose slot machine games are put on the major aisles in the casinos, again so that more people could see winning jackpots and be encouraged to play. However, 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 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!
These days, casinos are constantly changing their philosophy about where to place the loose slots.