Dave and his brother Uri is scammers from canada. They scam very a lot people on 999dice.
And if you know admin(jake) dont ban scammers.
999dice is the scam paradise, most of users are scammers because admin dont care, and if you have a rigged site, why to care about scammers?
source;
http://btcfeed.net/fraud/999dice-scam-exposed/