SE does pretty good mini games if you played any during summberbreeze (my fave is the shooting range) I would think dice games in ul'dum would be good. Maybe a guess the cup type game in LL. And a shooting range in gridania. You pay gil to do these games and earn points for items. Like rare mats. vanity gear of various styles, abd they can be set up by teirs mucg like cp points in ffxi.
maybe slot machines. And a lottery much like mob bonaza. (just more frequint and not to long a wait on numbers, like a weeky or by weeking event)