Games of chance are, by their very nature, addictive. Just like you keep scrolling on your phone day in and day out, expecting something exciting to come up after a dozen AI-generated slop clips, gambling drives you to repeatedly engage with it in anticipation of that one big win.
When combined with roguelike mechanics, which are also based on chance, randomization, and expectations, the result is rather interesting, as we've seen time and again with games like Balatro and Clover Pit. You never know what your next slot pull will bring or which jokers the store will contain. Every match is different, every pull another stroke of luck, and that's enough for your brain to start firing neurons left and right to encourage you to give it another go.
