That could be amusing but would people take the chance?
I like the idea about the mystery pots ..You could market it as a mini game add on to the game or just the bazaar. You offer 3-5 pots. Each pot costs a varying amount of gold or FSP .. The more you spend for a mystery pot the better your reward could be. A lottery type gold sink. This type of game could pop up randomly in the bazaar throughout the day.
I could see myself getting into trouble with this as I like me games of chance lol