Just be very careful when it comes to investing sir some of the sites were scam.. I would rather suggest that you'd take ur investment in coins trading that is legit and patronized by other people.. Thank you.
Choose well reputed casinos, those that are already here longer. Also, don't expect too much, a fake/scam gambling site(if there is any, I don't see one yet) would be offering bigger ROI compared to those regular casinos.
In my opinion it is worth it to invest at those casinos, it is like you are still gambling but with lesser to no effort and just waiting.