I tried slot machines in Vegas. Even themed ones for properties like Back to the Future were the single most boring experience I've ever had.
You'd think they would see mobile games and come up with a fun way to lose money, but they are just a chore.
I cannot conceive how people sit at those things. At least poker is a fun game. Never played it for money though.
In highschool I bought $20 in raffle tickets and won a $120 mini fridge that I used throughout college. I would get happy feelings when looking at that fridge for years.
Only positive feelings I ever got from gambling.