Investing in casinos is less risky as compare with gambling on. I think investment is good decision if we had some extra amount and can hold for some times. Than we could get profit by investing in gambling casinos because our will be on side of the house. Everybody know this the house always win in long run.
Although having an online casino might be profitable it is not guaranteed that all the investors will get their profit or even that they will have their money back. So it is better to invest in a site if you know the owner personally or if you can see that he/she have a great reputation here on this forum for example.