I worked at a casino in the late ’90s and was a slot attendant. We filled machines, cleared jams, paid out jackpots and replaced the knives. It was an Indian-run casino in NW MI.
The saddest thing I’ve seen in a casino was “the regulars”. People who were so addicted that they came daily. A few of them played certain machines only. These were usually slot machines they had won a jackpot on at some point, or even several. Since they were progressive, the jackpots they won were usually the small ones --when the progressive amount was low.