It's a good passive investment if the business are continue growing stronger, and with that basis the chance of gaining decent profits is possible, as we know from you mentioned casino business, Las vegas is really on top and if you manage to invest your money on their stocks the chance that you will earn will be there for you, though same with the other stocks if there's some news that will affects the business then expect that you will also see negative from your investment, it needed to have a good preparation before you deal and invest your hard earned money.
business sustainable despite of those losses considering that its not permanent.Just make it sure that you investment is really on proper checking and handling.
Always consider and expect about negative and that is why you do really make necessary actions whenever you do see this one.
You wont really earn something if you wont really be putting up some risk or making these type of decisions.