That's the reason I usually don't deposit my money in any new gambling sites. Better only gamble on reputed site which already many experts verified their bets and proven safe to bet. In gambling any way we need only luck to win apart from that if casinos cheat then you will never see any winnings in gambling.
But how can you know if their site is reputable or not if you never deposit? You should at least try and play there to make sure that they are really reputable or not. Some people try to bring X site down by doing this kind of thing though. So we can't believe on some reviews too sometimes
There are really some reviews that people do only rely on others opinions which means its not accurate on rating a particular website directly without any valid proofs. Some reviews are just based on their own view and opinion or add up on others comment,just like that. Trying out is good but just risk only a small amount so that you wont regret if you do experience problems ahead.
I prefer to check about the casino legitimacy here on BitcoinTalk Forum, in the official threads of the casinos. If there are good reviews here, they are legit for me. But it doesn't mean we will make profit, it doesn't decrease the risk to lose money. Casinos will still make profit on long term and most gamblers will still lose their money...
Winning money from gambling sites is depends on our luck as long as we play on a trusted probably fair sites. But if you choose to play on not probably fair sites then winning chances are nill. So I always only deposit money in good trusted and old sites to play and never keep my coins in any of the gambling sites. Before I close the gambling site will withdraw my money because anything can happen with these casinos.