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.
I don't think any casino bankroll investments will give any ROI because there is no guaranty that whether you make profit or loss from this investment. It may take few days or few months or year to reach your targetted profit in these casino investments. If more and more gamblers lose money then your profit % will go high but if gamblers win then you lose so this also depends on your luck and profit-making chances are high compared to gambling.