I don't think it's a good idea these days, there are a number of reputable bitcoin casinos here but they've been going for a number of years now, I think money has already been made there.
A lot of the newer casinos where you could potentially make good profit by investing in them are unproven trust wise, I just don't think it's worth the risk.
That is kind of true, that is why you really need huge bankroll to put on their old site investment so at least you can get something from.their site too. Nowadays new site wont open some investment because they think most of people wont take a part on it and in the opposite way people will think that nee site will scam though. But I can suggest you crypto-games.net and betking.io still profitable AFAIK