I have always wondered why in FF11, the card game that was separated (and where ppl had to pay to play) was not included at some point directly in FF11, with ranking, some IG rewards, tournaments etc. Im sure by keeping it separated, there was just nobody playing it...
Now that would have been kick-*** to just defy some guy in balista and then return-game with card, all in porogo island on the beach ! :)
the camera game to capture, train and then duel with your pet was something similar, but again, implementation and related rewards (even related IG fame rewards like having the picture of the colliseum champion on a wall in athurgan for example) were not good enough.
+1 to gold saucer, but fix the rest first ;)