I think it is not good to invest in casino which is good only if ypu have more money to waste in playing casino that is why casino is only for people who have more money or rich people.
Investing in a good casino is not at all a bad idea, in the long run you will make profit. when folks lose their coins, you'll make profits.
I think there is already some reviews about investing in gambling casino some of the gambling site can give a good profit like in betking according to the review that i saw in gambling section. so it is depends what gambling site you are investing..