~Some new sites give very nice bonuses and like I have mentioned earlier, giving them a trial is not a bad idea.
From my experience, you can win up to 0.01 BTC with 0.001 deposited on a new gambling site during a promotion. Only you shouldn't be too greedy thinking "What if I deposit 0.1? I can win 1 Bitcoin then!". Remember, dealing with newly appeared gambling sites is still very risky, and you might never see your deposited money again. And not because you can lose them to a game, but because you wouldn't be able to withdraw your balance from that site.
Must be careful when trying a new casino site because we do not know how the nature of the casino and still lack of trust. Even though they offer a good promo, it doesn't mean you have to try it by depositing a lot of money at the casino, at least 0.001
BTC is safe. It could be that the promotion is a trap.
Be at the minimum deposit is quite enough to have a test and to figure it out if that is legit or not. But base on my experience, we can't simply notice it at the very beginning as all the transactions run smoothly. Usually, the problem occurs when we have a huge amount to withdraw from their site. More often they do some delays and maintenance break for them not to be notice that they are actually manipulated the situation.