Pretty self-explanatory. Just like on any dragon warrior game, per-say.

You can gamble crowns and ce. Granted, it'd mostly be a losing proposition in many ways, as it is, after all, a casino. But who hasn't felt the addictive allure of casino's on all those great old RPGs we used to play. Plus, its extra content that will be a time-sink, while not making you further bored of the game. They could even make an option where you could gamble with mats, attempting to win rarer mats (thus giving folks something to do when out of CE or crowns. again, more content that doesn't hasten you approach to boredom of the game).

And they could make rare gear that can only be earned in the casino.
Come on, this is a brilliant idea, right? or have i just had too much coffee this morning, and too much nostalgia for the old school RPGs i grew up with?