I love to invest in casinos and gambling with bitcoins.
Just check your luck and get rich quick
yeah, but in this case if you "try your luck" it's gambling and not investing. Gambling can be VERY profitable....but if you win

But in long term gambling is not profitable (house edges etc...)
Somehow you can win like a lot without even know it because you never know when your luck comes. But what I do know if you investing on some trustworthy site you will really earn something there. Let me ask you, do you ever see that house losing their game? In the end they will always profitable because this is just some business where they make some profit
I think there are 2 things that you need to watch when it comes to investing to online casinos that accept 3rd party investors, and these 2 are the following:
1. You need to keep investing regularly to minimize the risk like if someone gets very lucky and win big time. If this happeneds, you can compensate the loss by investing regularly; and
2. You need to make it sure that the casino you are investing with is a very profitable one. You need to also keep updated of their news because they might announce some halting of accepting investment.