Acromage is indeed one of the many, many, many reasons I do love me some Might and Magic VII, though it's actually a lot better in the otherwise inferior Might and Magic VIII because it has more cards. Regardless, it's still a petty distraction and isn't deep enough to be a full game, but if one of those insane Finnish/Russian/Ukrainian/Norwegian/Swedish modder guys who are busy making Might and Magic fan projects that will never be released wants to make a competitively viable version of Acromage with online play, I'm on board.
Also, if we're talking about pointless gambling minigames, Suikoden III has them. One is basically a cross between Blackjack and Texas Hold-Em and sucks because of the weird way it counts cards, something that messes me up as someone who has never been great at math. Of course, you get hella cash money in that game not doing anything, so eh.
@Dalai: I will guiltily admit to playing far too much of that poker minigame in Super Mario 64DS. It actually helped me learn how to play. Keep in mind that I must have been... 11 or 12 when it came out. Crap. The DS is that old? Man. I'm old.