Gambling is not good if you want profit and you are the one to gamble. Profit in gambling is also good but it's very unstable in a way that you'll be streak in deficit. It's also hard to recover in gambling, that's why if you want to take a risk but you are comfortable that you can recover on it later on, go with legit investments.
Then that moment you might have to think about trading has bigger chance to make the mission completed successfully.
Noone can deny the fact that gambling isn't profitable for the long term.
Well i think investing in a casino is better than playing against the house and so if you get the chance to invest in bitcoin casino then you should go ahead unless you have a working strategy that can beat the house and that is the only time i will advice you to gamble instead.
No strategy can beat house suppose if anyone beat house it's just by luck not from strategy. But investing in casino sites also risky who knows when they will shut down and go home. If that happens to whom we have to ask? Whatever we invested everything will go. And to make a decent profit, we have to invest min 1 BTC this is also not worth but manageable.