[mugwumprk]

I think this touches on an idea that isn't necessarily intuitive. People may not always gamble for the monetary winnings; that's just their excuse. It may be that people do so for the sensory input, and corresponding chemicals their brains release. It would make an interesting (albeit unethical) study: design a casino game where it's impossible to win. Would people still get addicted? I suspect they would.

[azmodeus]

People still get addicted definitely for example the gatcha slot game: Watchers of Samsara in Dota 2.

I am not sure why slots work but gatchas are fun in moderation. I personally try to avoid them though and only consume them very rarely.