There surely are better things to invest in than casinos. 
So what are the better things to invest in? Personally, i invest in bitcoin casino and i have quite a good profit in it.
Indeed the best way to grow your bitcoins is investing and what can be better than investing in gambling site ? almost 1 lakh people gamble wth btc and they are sure to loose their money sooner or later. Dont know what can be better than investing in casinos.