Now that Just-Dice is no longer in operation, I would advise people who want to invest in dice sites to diversify. Spread your bitcoins between multiple dice sites. Dooglus was a highly trusted member here, and none of the new sites have the same reputation that Just-Dice had. Don't put all your eggs in one basket.
Actually, most of them do not have much reputation, they can run away with your money if they want to and nobody can find them. You don't earn much from dice sites, if one of them goes, you may not be able to recover your investments. There isn't much dice sites in the first place.