For me it's mahjong. The game is everywhere in asian media but I tune out everytime it comes up. The whole thing seems esoteric, so much mahjong terminology, for me it's like looking at a mechanics manual when I take a glance at the rules. I thought I'd give it a shot in Gold Saucer but nope, couldn't even get through one game.
Tables are always empty on my server too, hope they didn't spend too much time on that.