I'm pretty sure they were making a nice income of 100,000$ / month. if not more.
why they close ?
As we know they only have one game that is dice game, maybe they intend to open a new casino that has more game options or they are closed because they are getting enough profit and also they are afraid the dice game will can't compete with other games. did you lose fund or something? just wait the official statement from Rollin.