Getting rid of the big metal clinking bins was a seriously hard sell when the push for coinless machines was just getting started.
Casinos have spent an absurd amount of time and money over the years studying every aspect of gambling psychology and how slot machines can best exploit it. All the various beeps, dings and melodies emitted by the older style (non-video) machines were almost always in the key of C (and that's still fairly common on new machines unless they're playing licensed music) because they learned that people found that key to be the most calming and "feel-good" for players.
That trademark clink-clink-clink sound those metal bins make isn't an accident. They're deliberately made (from the shape all the way down to the metallurgy) to be as loud and distinctive as possible, making the sound easy to hear and pick out over all the other noises in the casino. The casinos want people to hear slot machines paying out winnings. It encourages them to start playing, hoping to hear that same sound from their chosen machine.
They do even crazier shit like scenting the air and laying down those god-awful patterns on the carpeting all in the name of luring more people in to gamble and stay at it longer.
I can't wait to hear what he has to say about the weather out there in August.