One more thing the gambling den in Dondoran is way too easy to win I won way to much that place is NOT profitable with that win rate.
The Casino is basically a difficulty adjustment. The game is rather stingy with money, and items are expensive. It's there to let people get some money back if they're having trouble with consumable upkeep. I didn't want players to feel like they got screwed out of spending all their money and items on particularly tough fights. It's also a preventative measure against soft locking.
The balance of the minigame winrate isn't a particularly high priority. I also just figured it'd be fun to have a Casino.