Yes you can start it but i think you should limit max bet
I think new dice sites won't be able compete with old and trusted sites, there's no point starting a new dice site if you don't have something unique in your site. also if you limit the max win/bet below 1 btc folks might not even play.
New sites also can compete with old sites, but they need to spend a lot of money on promotions and marketing until people trust a site. For that, I don't think 30 BTC is a good amount to start because he may need more than half of his money just to develop a site and for marketing so left very less amount for bankroll. It is very risky for site owners to run with small bankroll.