As a new player, what attracted me to the game in the first place wasn't a dream to make money, it was just for fun. I'm more of a statistics type thinker and this game appeals to that side with chance, luck, percentages and having the skill to think this way on your feet. So for me it's like an intellectual, challenging kind of fun that feels very rewarding when I make the right play.
Another reason is that deceit and lying are things that are frowned upon in society, so having a harmless game that not allows that but also rewards it is also a bit of a thrill.