Also, i find that gif image highly suspect. I bet you can replicate it in Chrome with the elements toolbar quite easily.
The point I'm getting at is this isn't just suspicious/shady behavior in itself. The reason why I posted this was because 999Dice claimed to have a bank of 3000 coins and was taking large bets and then left bitcointalk when myself and tomatocage asked for proof. If people choose to use the site I won't stop you, but it is important to warn others to prevent a potential future scam.
Edited my title, you make a good point. The owner is a liar though and I'm very sure he is simpledice but I am not 100% sure he has intentions to scam. I would be willing to place money on this being a scam but I've changed the title to be a bit more sensitive.