There will be strong competition with Dice site - there are a lot of them. Players like to play in their own favourite dice, which they know already, so I would suggest even not to think on this
Of course. Player wants to play in a dice game which has a big bankroll in way to win a great amount of BTC. So, I don't advice you to create a dice game, there will be many problem in future and it's very hard to grow up when there already are dice game like "PrimeDice" "JustDice" and "PRCDice".